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number of non-negative integral solutions of

a+b+c+d<=15 ?

any method to know prime numbers quickly

venn diagram questions

For a given (n,m,k)..

Using values in the range (0..k), how many different m-combos can be made which sum to n?

For example, if (n,m,k) = (3,3,2) there are 7 possible combinations. For (5,4,2) there seem to be 16.

I've been trying to approach this like the binomial formula, stars and bars sort of deal but the k-constraint is puzzling me and I'm not entirely sure of what to do.

give questions for ib acio

Where I get current affairs as in the form of audio files in English?if you know please tell me..

How I do spotting error 

how to solve inequality problems

AS WE SEE NEW PATTERN OF ENGLISH IN IBPS PO PRE 2017,WHAT WILL BE THE NEW EXPECTED  PATTERN OF IBPS CLERK PRE?PLEASE TELL ME BECAUSE I AM WEAK IN ENGLISH..

In a triangle abc bd is the median drawn from vertes on the side of ac a line cf drawn from vertex c to the point f on the side ab bisects bd 1:1 at e if bf =6 units find ab