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Sticky Note
At a conference, 12 members shook hands with each other before and after the meeting. How many total member of hand shakes occurred?
  1. 121
  2. 114
  3. 132
  4. None of these
Explanation

To find the total number of handshakes, we use the combination formula since each member shakes hands with every other member exactly once before and after the meeting.

Number of members = 12

Handshakes before the meeting = 12C2 = (12 × 11) / 2 = 66

Handshakes after the meeting = 66

Total handshakes = 66 + 66 = 132

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