Varun Goel
a month ago
There are 10 people in a room. If each person shakes hands with exactly 3 other people, what is the total number of hand
Guys, there are 10 people in a room. If each person shakes hands with exactly 3 other people, what is the total number of handshakes?
A. 15
B. 30
C. 45
D. 60
E. 120
Can someone answer this one? #gmat #problemsolving
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Jaideep Hooda
Consider one hand that gets shaken as one event. One person shakes his hand with three other people so 3 events take place per person. In all 10*3 = 30 events take place. But two hands make one handshake. So 30 of these events will make 15 handshakes. Answer : A See more