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Q: There are 15 people they all shake hands how many hand shakes are there?

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45 handshakes

36. Everybody shakes 8 hands but each shake counts for 2 people. So 9*8/2=36.

4950

210

72

one....

the first shakes 8 people's hands (remember, not his own), the second 7 (he doesn't shake the first one's hand), then the third shakes six, the fourth shakes 5, the fifth shakes 4, the sixth shakes 3, the seventh shakes 2, and the 8th shakes the 9ths hand so 8+7+6+5+4+3+2+1 = 36

First person shakes hands 19 times, second person 18 etc, a total of 190.

20 hand shakes would take place. Here's how: 1234567 23456 34567 4567 567 67 7 And a person can't shake his own hand or someones hands twice

If each person is shaking with only one hand, then the answer is seven. If they are shaking with both hands, then the answer is 14.

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Most people are right-handed, therefore we shake hands with our right (strong) hand.

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