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Q: If there are 100 people at a party and they all shake hands once how many hand shakes will there be?
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Related questions

Five people shake hands with every one how many shakes were there?

25 shakes


There are 9 people they all shake hands how many hand shakes are there?

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


There are 10 people they all shake hands how many hand shakes are there?

45 handshakes


In a party of 35 people shake hand with everyone?

595 If you have 35 people and everyone shakes hands with everone else, you have 35x34/2 total handshakes. To see this think of three people, and fix one of them, say it's you! You shake hands with everyone meaning you shake hands with 2 people And each of them shakes hands with each other, that is two people other than you so the total 2+1= 3 which is 3x2/2 Try it with 4, you shake hand with 3 people, and they all shake hands with each other so we have your 3 plus 3 more. To see the three more, just look at what we just did above. 4x3/2=6, We divide by 2 to avoid double counting. Because you shake hands with me and I shake hands with you, but we only shake hands once, so divide the total by 2. In general for n people at a party, we have n(n-1)/2handshakes.


21 people shake hands with each other How many hand shakes are exchanged?

210


How many hand shakes if 12 people shake hands with every other person in room?

72


TJ is hosting a dinner party TJ greets the first guest and they shake hands The second guest arrives and shakes hands with TJ and the first guest The third guest arrives and shakes hands with?

45 Handshakes All Together


If seven girls arrived at a tea party and each of them shake hands once with each of the others how many hand shakes is that?

Six


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

105 ( First person shakes 14 different hands, second shakes 13 etc etc down to 14th shakes 1 hand. Sum of 1 to 14 = 105.)


How many handshakes will be there be in total if 9 people shake hands with each other?

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


How many hand shakes would take place if 20 people shake hands once?

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


If the friends shake hands mutually then the total number of hand shakes is?

one....

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