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If ten friends shake hands mutually, then the total number of hand shakes is
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- 45
- 50
- 90
- 100
- 45
Correct Option: A
It is to be noted that when two persons shake hands it is counted as one hand shake not two. So this is a problem on combination. The total number of hand shakes is
= The number of ways of selecting 2 persons out of 10 persons
| = 10C2 = | = 45 | |
| 1 × 2 |
