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Thirteen guests have participated in a dinner. The number of handshakes that happened in the dinner is: (a) 715 (b) 78 (c) 286 (d) 13 (b) 78 |
Answer» (b) 78 To handshakes, we need two guests. Number of selecting 2 guests from 13 is 13C2 = \(\frac{13\times12}{2\times1}\) = 78 |
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