Question

Answer any question you want and please mention the process pleaseeeee,,,,,

Answer 1

Answer:

91

Step-by-step explanation:

First man shakes hand with 66 people.

Second with 65 people.(all except first because they already shaked their hands)

similarly third with 64.

goes on

so we can say that total hand shakes= 66+65+64......+1

=n(n+1)/2 (sum of n terms in series)

where n=66.