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12 members were present at a board meeting. Each member shake hands with all of the other members before and after the meeting .How many hand shakes were there?

130
134
132
135
Explanation:

In order to have a hand shake there must be two members. Therefore to select 2 out of 12 we have 12C2.

This happens twice that is before and after the meeting

Answer = 12C2 × 2 = 132.

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