At the end of a business conference the ten people present all shake hands with

Question

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 ?

Options:

A . 20

B . 45

C . 55

D . 90

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

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