Since there are a fair number of posts up by now, finding an old post on a particular topic might prove troublesome. This page will provide quick links to the older posts. We’ll update it at infrequent intervals π

PnC in Geometry – 3-D painting 3

PnC in Geometry – 3-D painting 2

PnC in Geometry – 3-D painting 1

PnC in Geometry – Dividing a plane

PnC in Geometry – Lines from points 2

PnC in Geometry – Lines from points 1

PnC Examples – Whole number solutions – variants

PnC Examples – Selecting subsets

PnC Examples – Distribution of Identical Objects of multiple types

PnC Examples – Numbers with fixed digit sum

PnC Examples – Selecting seats 2

PnC Examples – Selecting seats 1

Jul

17th Algebra – 16

15th Algebra – 15

10th Algebra – 14

8th Algebra – 13

3rd Algebra – 12

1st Algebra – 11

Jun

26th Algebra – 10

24th Algebra – 9

19th Algebra – 8

17th Algebra – 7

12th Algebra – 6

10th Algebra – 5

5th Algebra – 4

3rd Algebra – 3

May

29th Algebra – 2

27th Algebra – 1

22nd Logs – 10

20th Logs – 9

15th Logs – 8

13th Logs – 7

8th Logs – 6

6th Logs – 5

1st Logs – 4

Apr

29th Logs – 3

24th Logs – 2

22th Logs – 1

17th Puzzles – 20

15th Puzzles – 19

10th Puzzles – 18

8th Puzzles – 17

3rd Puzzles – 16

1st Puzzles – 15

Mar

27th Puzzles – 14

25th Puzzles – 13

20th Puzzles – 12

18th Puzzles – 11

13th Puzzles – 10

11th Puzzles – 9

6th Puzzles – 8

4th Puzzles – 7

Feb 14

27th Puzzles – 6

25th Puzzles – 5

20th Puzzles – 4

18th Puzzles – 3

13th Puzzles – 2

11th Puzzles – 1

Jan

2nd XAT Scan – 8

1st XAT Scan – 7

Dec

31st XAT Scan – 6

30th XAT Scan – 5

26th XAT Scan – 4

25th XAT Scan – 3

24th XAT Scan – 2

23rd XAT Scan – 1

19th Sequences -16

18th Sequences – 15

17th Sequences – 14

16th Sequences – 13

12th Sequences – 12

11th Sequences – 11

10th Sequences – 10

9th Sequences – 9

7th Quant 5 – The Number Line Problem

5th Sequences – 8

4th Sequences – 7

3rd Sequences – 6

2nd Sequences – 5

Nov

28th Sequences – 4

27th Sequences – 3

26th Sequences – 2

25th Sequences – 1

21st Last Digits – 4

20th Last Digits – 3

19th Last Digits – 2

18th Last Digits – 1

4th Modulus Plotting – CAT Scan

2nd Quant 4 – When to Avoid the Venn

Oct

31st Modulus Examples – 2

30th Modulus Examples – 1

29th Modulus Functions in Two Variables – 6

28th Modulus Functions in Two Variables – 5

26th Quant 3 – Looking from the Other Side

24th Modulus Functions in Two Variables – 4

23rd Modulus Functions in Two Variables – 3

22nd Modulus Functions in Two Variables – 2

21st Modulus Functions in Two Variables – 1

19th Quant 2 – Concepts, not Formulae

17th Modulus Addition – 4

16th Modulus Addition – 3

15th Modulus Addition – 2

14th Modulus Addition – 1

10th Modulus Plotting – 4 (Maxima and Minima)

3rd Frustum – Applied Similarity

2nd The Truncated Cone – The Frustum

Sep

30th Similarity in 3-D

14th GMAT – Probability 1

12th Spotting Similarity and Congruence

11th Debunking the Angle-Side-Side Test

10th Triangles – Similarity and Congruence

Aug

31st Data Sufficiency – 1

29th Fibonacci in Geometry – some examples

27th The Golden Ratio

15th Some thoughts on Inradii and Circumradii

14th Triangles – Area Formulae

13th Some more useful triangles

10th Data Sufficiency – 0

8th The Angle Bisector Theorem

6th The Basic Proportionality Theorem

1st The Incentre

July

31st The Circumcentre

30th The Centroid

29th The Orthocentre

25th Writer’s Block – CAT Scan 4

24th Writer’s Block – CAT Scan 3

23rd Writer’s Block – CAT Scan 2

22nd Writer’s Block – CAT Scan 1

18th Singles – 8

17th Singles – 7

16th Singles – 6

15th Singles – 5

11th Singles – 4

10th Singles – 3

9th Singles – 2

8th Singles – 1

4th Unwrite – 4

3rd Unwrite – 3

2nd Unwrite – 2

1st Unwrite – 1

June

27th Writer’s Block – 8

26th Writer’s Block – 7

25th Writer’s Block – 6

24th Writer’s Block – 5

20th Writer’s Block – 4

19th Writer’s block – 3

18th Writer’s Block – 2

17th Writer’s Block – 1

12th Some Basic Tricks

11th Base Systems – Properties

10th Base Systems- Introduction

6th PnC Round-up

4th Theory of Partitioning – CAT Scan

3rd PnC CAT Scan – 2

May

30th PnC CAT Scan – 1

29th The Necklace Problem

28th Derangements – 2

27th Derangements – Introduction

23rd Rings and Fingers

22nd Distinct Objects in Identical Groups

21st Identical Objects in Identical Groups

20th Distribution with Upper Limits on Group Size

16th Distribution of Some or All Objects, Distinct Groups

15th Partitioning – Some Examples

14th Theory of Partitioning 2 (No Groups Empty)

13th Theory of Partitioning 1 (Groups may be Empty)

9th Inscribed Angle Theorem – CAT Scan

8th Inscribed Angle Theorem – Applications

7th Circles and Quadrilaterals

6th The Inscribed Angle Theorem

**Apr**

30th An interesting property of the Trapezium

29th The Trapezium

25th PnC Examples 7

24th PnC Examples 6

23rd PnC Examples 5

22nd PnC Examples 4

18th Pnc Examples 3

17th PnC Examples 2

16th PnC Examples 1

11th To Permute or to Combine?

10th Combinations

9th Forming Numbers

8th Forming Words

4th Sending distinct objects to distinct groups

2nd Permutations

1st Arrangements with some objects identical

**Mar**

28th Variant Arrangements

27th Basic Linear and Circular Arrangements

26th FPC – Examples

25th The Fundamental Principle of Counting

21st The Chinese Remainder Theorem

19th Remainders with Specific Divisors

18th Remainders and the Binomial Theorem

14th Pascal’s Triangle – Examples

13th Pascal’s Triangle and Combinations

12th Pascal’s Triangle – Introduction

11th The Binomial Theorem

7th Applying Negative Remainders

4th Remainders of Sums and Products

**Feb**

28th Remainders – 4

27th Remainders – 3

26th Remainders – 2

25th Remainders – 1

21st Multiplication – 2

20th Multiplication – 1

18th Shortest Path 5

14th Shortest Path 4

13th Shortest Path 3

12th Shortest Path 2

11th Shortest Path 1

7th Escalators – 2

6th Escalators – 1

5th TSD – 2

4th TSD – 1

**Jan**

31st Sum of Factors

30th Number of Factors

29th Fixed and Variable Costs – 2

28th Fixed and Variable Costs – 1

24th Weighted Averages – CAT Scan

14th Logical puzzle

Hi,

can you please post maths post after month of july..?

it is difficult to find others in the blog…

Neha, updated. Sorry for the lag, but as we get closer to CAT the load increases exponentially π

regards

J

thanks a lot sir..!!! π π

Sir, now is the time to update again please.. π

Will try Yash, but chances are till CAT is done and dusted my life is going to be rather packed π It’s only a month’s worth of posts that is not updated anyway…

regards

J

Please post some contents on geometry,mensuration,solid bodies.

We will, Harsh. But slowly π From next week we are going to dramatically slow down the flow of posts…so that we authors can get back to having a life π

regards

J

Sir, Please update the posts here π will be really useful.

Done!

regards

J

How about a post on faulty clocks? And complex time work problems?

hii sir

can u please post few problems on the application of number system, ordered unordered pairs and anything that u think might help us

i must say sir the way u explain or provide logic is very effective and easy to grasp

can we please have a post on venn diagrams scrabbler sir!! especially maxima and minima.TIA

sir can you please update this page now..??

please post new content. So many days since a math post π¦

Last year I could not do any DI but did ample maths. Currently rectifying that lack by doing DI π Only human, so there is a limit to what I can accomplish…

regards

J

Sir can we have posts on maximizing and minimizing in set theory and few quality questions on functions and graphs,that would be very very helpful.Thanks again π

if can u help me 2 derive formula for

n1=x+75

n2=X+75+75

n3=X+75+75+75

……………………………….till n16

is 16+75(16*17/2) will it fetch me a right ans?

I assume you mean 16

X+ 75(16*17)/2..regards

J

Great work with all them concepts. Really helpful

Where are the VA posts ? Need em here.. π

Please update the page

Sir plw update the page . post more stuff

I don’t have much more to post where I can add significant value. Also, health + work combine to keep me away from the computer currently…

regards

J

How about T?

He is also quite occupied π Besides, he would prefer to post VA rather than QA! However, he does post fairly regularly here: http://www.imschennai.in/blog/

regards

J

Hello Sir, Would be great if you could upload an article where area and volume of 3D figures like Pyramid, Prisms, tetrahedron etc are derived.. Thank you βΊοΈ

That’s a pretty straightforward derivation and I wouldn’t be able to add any value to what we see in the standard textbooks actually!

regards

J

A Russian luxury pen maker sells βxβ pens to a supermarket called Large Bazaar at a total price of Rs.(100 + 120x). If the Large Bazaar sells all the pens at a total price of Rs. 3×2, find the maximum loss (in Rs.) that could have been incurred by the Large Bazaar.

what could be other method to find mxm loss without using double diffrentiation.

Max/min of a quadratic occurs at x = -b/2a. That would give us the same result as double differentiation!

regards

J

Let x be 1, then the bazaar bought a pen at a price of Rs. 220 and sells it at 312 which profits the bazaar. As the number of pens increase the profit decreases. The maximum value of x can be 9. For 9 pens the cost price will be 100+120*9 = 1180. Selling price is 392. So 1180 -392=788 which is the maximum possible loss.

Let x be 1 then cost price = 220 Selling price = 312 which profits the bazaar. As the value of x increases the profits decreases. The maximum value of x can be 9.

So Cost price = 100+ 120*9 = 1180. Selling price = 392. maximum loss = 1180 – 392 = 788

Hello Sir,

Could you put up a post explaining clocks.That would be of great help.

Noticed that some of the probability articles (19-28) do not show up on the list of “Maths Posts”, but while going through the individual topics, those appear in the “Next Article”/”Previous Article” link. Could you please add the links for these to the list?

Hi J,

Could there be a post on “Binary Logic” – Truth tellers, liers and alternators? How to approach those sets?

Probably not, for two reasons: firstly, I haven’t seen those ever coming in CAT, and secondly, I solve them slowly and painfully when I encounter such questions π I don’t have any particularly useful trick or approach to add. I prefer to post only where I feel I can provide some genuine value-add…

regards

J

Sir I am a fresher for cat preparation… From where am I supposed to start from your blog.

What you could do is, go to the “tag cloud” on the right side and pick a topic. You’ll get all the posts which are related to that particular topic. Go down to the last (i.e. earliest) post on that topic and start reading upward from there! Not all topics are comprehensively covered; I have focused on those where I felt I could add some value above and beyond the obvious stuff found in any textbook.

regards

J

Hi,

I want to improve my arithmatic skills. Can you please recommend a sequence in which I should go through this blog. Thanks π

Gautam, I haven’t really put up that much on Arithmetic; I have focused on the topics where people generally have trouble with the standard approaches (notably Number Theory and Combinatorics). In Arithmetic, you should probably cover the basics from any standard textbook, and then go through the “Paperless” tag in this blog, there you will find a fair number of arithmetic questions with alternative approaches.

regards

J

can u help me in solving this question.

x=root(1+2(root2+3(root3+4root(4+5root…..so on)))

Are there any updated posts after Jul/Aug?

I am afraid not. Two reasons – one is that I have said most of what I wished to say (where I can add significant value), the second and more crucial is that my health has not permitted it (I’m under doctor’s orders to reduce screen-time if I wish to preserve my eyesight).

regards

J

Oh, you should take care of yourself. And thanks a lot for all your posts. I have literally downloaded all of them and made pdfs so that they are handy everywhere. π

Hello Sir, I am just starting for CAT’17 with almost 140 days remaining. Where to start from your blog please guide me.There are lots of posts. I am confused what to study what not to.

First of all understand that this blog (or any other source) will not magically prepare you. It is just a prop to aid you in improving and to offer some different perspectives and approaches for problems. Not every topic is covered in detail, only those where I felt I had some value add to offer over and above the common sources. Having said which, a good place to start might be PnC

(go to the “PnC” tag on the right; there would be around 50 posts. Start reading from the bottom, from the Fundamental Principle of counting!). Remainders would be another good place to start. Another possible approach would be to cover some small but useful topics – I would recommend Logs, Last Digits, Coordinate Geometry and maybe Bases as good places to begin here. When you get a bit closer to the exam and some basics are in place, you should visit the “Paperless” tag to get some idea of how one could solve certain problems in a more efficient manner, with minimal writing.regards

J

Sir, Can you post something regarding max and min of functions

Currently unable to post for health reasons. But I have already posted something on Modulus functions in the co-geo section.

regards

J

sir as cat is nearly 75 days away what is the best way to prepare. Please make a post regarding the steps for effective prep in all areas

Work on strategy – take tests, analyse them and learn from them. These might help:

https://cat100percentile.com/2014/10/07/catalysis-1/

https://cat100percentile.com/2014/10/14/catalysis-2/

https://cat100percentile.com/tag/cat-2014-test-taking-strategy/

regards

J

sir why have you stopped posting

oh sorry just saw the new posts

when I see the QA ques i got stuck i cant understand how to proceed plzz tell how to improve this

Practice. If that doesn’t work, probably nothing will.

regards

J

Sir, I had a small query. Does attempting TITA questions wrongly have any effect on my percentile due to less accuracy? (I know I wouldn’t get negative marks for TITA question.)

No. None whatsoever. If you get a particular raw score (say 30) in a particular section in a particular slot, you will get the same percentile irrespective of how you arrived at that score (for example “10 correct” or “11 correct 3 wrong” or “10 correct + 5 TITA wrong”)

regards

J

Sir, Can you let me know if you have a blog on ‘pipes and cisterns’ types of sums? I tried finding them, but couldn’t find them.

While I haven’t covered pipes and cisterns specifically, I have done some posts on the basic “work” concept; pipes and cisterns requires pretty much the same logic, and hopefully you should be able to extrapolate. You can find those here: https://cat100percentile.com/tag/work/

regards

J

Sir, i tried finding questions on VENN but can’t find it…can you tell me if you have uploaded them or not?

thank you

Hello J!

Can you please send me the link, where i can find the post related to LR/DI and verbal.

No separate link… as the vast majority of the posts are maths, I made a separate link for that. Verbal/Vocab/DI just click on the tag and you will get the relevant posts.

regards

J

But i am only getting a tab for maths not for verbal and LR/DI

Not a tab, a tag from the tag cloud at the right side of the main page π

regards

J

I am so sorry to disturb you again but i just a tag bar in which i can see the post in reader and copy shortlink thats it.

https://cat100percentile.com/tag/verbal/

https://cat100percentile.com/tag/di/

Thankyou so much J!