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There are 15 people they all shake hands how many hand shakes are there?
Wiki User
∙ 13y ago
105 ( First person shakes 14 different hands, second shakes 13 etc etc down to 14th shakes 1 hand. Sum of 1 to 14 = 105.)
Wiki User
∙ 13y ago
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There are 10 people they all shake hands how many hand shakes are there?
45 handshakes
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.
21 people shake hands with each other How many hand shakes are exchanged?
210
If there are 100 people at a party and they all shake hands once how many hand shakes will there be?
4950
If seven people are in a room and they shake hands with each other once how many hand shakes would take place?
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
There are 10 people they all shake hands how many hand shakes are there?
45 handshakes
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.
21 people shake hands with each other How many hand shakes are exchanged?
210
If there are 100 people at a party and they all shake hands once how many hand shakes will there be?
4950
How many hand shakes if 12 people shake hands with every other person in room?
72
If the friends shake hands mutually then the total number of hand shakes is?
one....
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 seven people are in a room and they shake hands with each other once how many hand shakes would take place?
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
How many hand shakes would take place if 14 people shake hands once?
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.
If 2000 people shake hands once with everyone in the room how many hand shakes would take place?
1 999 000
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.
