General studies Question what is the answer? Watch

abzkik
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I got this question in one of my general studies exam:
If there are 9 professors in a room and they all shake hands with each other once, how many handshakes were there in total?
Which I thought I got right and started talking about it, but everyone seemed to get different to me..I got 72. What have you got?
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james9309
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haha, it was 36, because the 1st prof shakes 8 hands, including the 2nd profs hand, so then the 2nd prof only shakes another 7 hands and it goes on like that and = 36
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