Everybody in a room shakes hands with everybody else. The total number of hand-shakes is 55. The total number of persons in the room is:
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Q:
Everybody in a room shakes hands with everybody else. The total number of hand-shakes is 55. The total number of persons in the room is:
- 111true
- 212false
- 38false
- 414false
- 5None of thesefalse
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