12 attended a business party and each of them shake hands with each other exactly once how many handshakes happened in the party
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12 multipled by 12 equal 144
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I think their will be 78 shake hand because i use triangular number of 12
harshalthawaney20651:
There are 12 people so each will have 11 hand shakes, so 12 × 11 =132 , this is double of no. of handshakes because at a time 2 people shake hands , so no. of handshakes is 66
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