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 ?
[A].20
45
55
90
[A].
[B].
[C].
[D].
Answer: Option B
Explanation:
Clearly, total number of handshakes = (9+ 8 + 7 + 6 + 5 + 4 + 3 + 2+1) = 45.