2 months and I’m glad I saw your blog post for Algebra today. I was always forming cases to get the number of solutions for non-neg and now I learnt today, how to do that wayy quicker without jotting them down as prescribed in Algebra-9. Thank you Sir! We can never go places without you 🙂 Thanks!
CAT-holics 
Nice application. Presented here. 🙂 Great Posts Sir.
2 months and I’m glad I saw your blog post for Algebra today. I was always forming cases to get the number of solutions for non-neg and now I learnt today, how to do that wayy quicker without jotting them down as prescribed in Algebra-9. Thank you Sir! We can never go places without you 🙂 Thanks!
In last question, I think we have to find positive integer solution. So, x ,y,z, shouldn’t be considered as 0
Why? No one stops you from paying in only one or two denominations (unless of course there’s a sudden demonetisation)
regards
J