Others Maths Puzzle Numerical Ability permutation and combination

Q. There are 32 tennis players, playing single's tournament. How many games do they have to play for determining the winner?

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Others Other Question

Q. There are 4 black, 4 red, 4 white and 4 pink socks in a basket, and you are blind folded, how many socks should select such that there are atleast 2 of them belongs to same color? Q. Solve:
1/sqrt (x^2 + r^2)^1.5 dx from 0 to infinity