# Maths Posts

## 71 thoughts on “Maths Posts”

1. Neha |

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

2. Yash Dubey |

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

3. Harsh Vardhan |

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

4. vivek |

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

5. jaspreet |

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

6. sunil |

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

7. Karan |

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

9. Karan |

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

10. shashank |

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

11. RIC |

if can u help me 2 derive formula for
n1=x+75
n2=X+75+75
n3=X+75+75+75
……………………………….till n16

12. RIC |

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

• I assume you mean 16X + 75(16*17)/2..

regards
J

13. Great work with all them concepts. Really helpful

14. d00mthepuy |

Where are the VA posts ? Need em here.. π

15. Abhinav |

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

• M |

16. Ashish |

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 βΊοΈ

• 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

17. SUNIL KUMAR PANDEY |

A Russian luxury pen maker sells βxβ 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

• Jayachandran |

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

18. Hello Sir,
Could you put up a post explaining clocks.That would be of great help.

19. 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?

20. 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

21. Soundarya |

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

22. Gautam |

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

23. can u help me in solving this question.
x=root(1+2(root2+3(root3+4root(4+5root…..so on)))

24. Arjun Pratap Singh Saharan |

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

25. 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

26. Ankur Parmar |

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

• Missy Cooper |

And the Unwrite series too is about that right?
Found it to be a gem indeed !

• Yes, the Unwrite set is part of the overall paperless tag π Glad if it was of help!

regards
J

27. Manish |

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

28. 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

29. utsav |

sir why have you stopped posting

• utsav |

oh sorry just saw the new posts

30. Rajat J Prakash |

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

32. VINNY |

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

33. ransh singh |

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

34. Akanksha pathak |

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

• Akanksha pathak |

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

• akankshapathak28 |

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.

• akankshapathak28 |

Thankyou so much J!

35. Tanya |

Hi sir, when did you post last? just want to check if i have missed on any post!

• Nothing this year so far, as of now nothing planned either. If I think of something interesting/useful will post π

regards
J