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CGP EDU Academic Team
Published on: August 14, 2026
Everybody in a room shakes hands with every body else. The total number of hand shakes is 66. The total number of persons in the room is -
Text Solution
Verified by ExpertsThe correct answer is:
B
Let no. of persons be n
no. of hand shakes = n C 2
n C 2 = 66, 
= 66
n 2 – n – 132 = 0
n = –11, 12
n = 12 (n = – 11 impossible)
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