Question

Five people meet for the first time and shake each other's hand once.

Determine the number of handshakes.

Answer options with 5 options
A.
5

B.
10

C.
15

D.
20

E.
120

Answer 1

B: 10

Explanation:

If three people shake hands there are 3 handshakes. If four people shake hands there are 3 more handshakes so 3 + 3 = 6 in total. If five people shake hands there are another 4 handshakes so 6 + 4 = 10