TCS Company Numerical Ability Number System

23 people are there, they are shaking hands together, how many hand shakes possible,if they are in pair of cyclic sequence.

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TCS Other Question

A block has dimensions 10,9,5 units.how many units cube is needed to make a block of that size? sangarkara and pointing selects batting by using a dice,but the dice is biased.so to resolve, pointing takes out a coin. what is the probability that the dice shows correct option?