anonymous
  • anonymous
There are 7 people at a party and they shake each other's hand once. How many hand shakes are there?
Mathematics
schrodinger
  • schrodinger
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anonymous
  • anonymous
A person can only shake the hand of 6 others.....
anonymous
  • anonymous
i don't think that is right
anonymous
  • anonymous
Thank you

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

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