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OpenStudy (anonymous):
There are 7 people at a party and they shake each other's hand once. How many hand shakes are there?
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OpenStudy (anonymous):
A person can only shake the hand of 6 others.....
OpenStudy (anonymous):
i don't think that is right
OpenStudy (anonymous):
Thank you
OpenStudy (anonymous):
for...
OpenStudy (anonymous):
you know for what!
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OpenStudy (anonymous):
C(2,7)=21
OpenStudy (anonymous):
thats correct @mukushla
but where does the 2 come from?
OpenStudy (anonymous):
is it because person A shakes hands with person B
And then person B shakes hands with person A
OpenStudy (anonymous):
One can shake 6 so there are 7 by 6 but this counts a single handshake twice.
OpenStudy (anonymous):
^they can't shake hands twice
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OpenStudy (anonymous):
oh i see so why is it 7C2?
OpenStudy (anonymous):
like i get how you say its like 6+5+4+3+2+1 =21 which is the same ans as 7C2
OpenStudy (anonymous):
@higgs the answer is 21 according to my solution book
OpenStudy (anonymous):
Forget the handshakes, how many ways to choose 2 from 7 without regard to order?
OpenStudy (anonymous):
why choose 2 from 7
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OpenStudy (anonymous):
2 people (ie 2 hands)
OpenStudy (anonymous):
ohhhh i see , wow i guess thats a nice way to think about it
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