Question

Fifteen persons in a meeting shake hands with each other. How many handshakes were interchanged?

• A. 95
• B. 105
• C. 68
• D. 116

Answer 1

Answer:

B. 105

No. of shake hand = n(n=1)/2 = 15(15=1)/2 = (15x14)/2 = 15x7 = 105