In a party of 12 person, how many hand shakes are possible, if every person handshake with every other person?
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12×11=132 because 12 person handshake each other so on people to every
Answered by
1
Total number of handshakes
= The number of ways of selecting 2 persons from among 12 persons
=
12
C
2
= 12×11/2×1
=66
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