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Arithmetic Reasoning - Verbal and Reasoning

Q1:

At the end of a business conference the ten people present all shake hands with each other once. How many handshakes will there be altogether ?

A 20

B 45

C 55

D 90

ANS:B - 45

Explanation: Clearly, total number of handshakes = (9+ 8 + 7 + 6 + 5 + 4 + 3 + 2+1) = 45.