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virtus

There are 7 people at a party and they shake each other's hand once. How many hand shakes are there?

  • one year ago
  • one year ago

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  1. estudier
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    A person can only shake the hand of 6 others.....

    • one year ago
  2. virtus
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    i don't think that is right

    • one year ago
  3. smr_kml
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    Thank you

    • one year ago
  4. virtus
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    for...

    • one year ago
  5. smr_kml
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    you know for what!

    • one year ago
  6. mukushla
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    C(2,7)=21

    • one year ago
  7. virtus
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    thats correct @mukushla but where does the 2 come from?

    • one year ago
  8. virtus
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    is it because person A shakes hands with person B And then person B shakes hands with person A

    • one year ago
  9. estudier
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    One can shake 6 so there are 7 by 6 but this counts a single handshake twice.

    • one year ago
  10. higgs
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    ^they can't shake hands twice

    • one year ago
  11. virtus
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    oh i see so why is it 7C2?

    • one year ago
  12. virtus
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    like i get how you say its like 6+5+4+3+2+1 =21 which is the same ans as 7C2

    • one year ago
  13. virtus
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    @higgs the answer is 21 according to my solution book

    • one year ago
  14. estudier
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    Forget the handshakes, how many ways to choose 2 from 7 without regard to order?

    • one year ago
  15. virtus
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    why choose 2 from 7

    • one year ago
  16. estudier
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    2 people (ie 2 hands)

    • one year ago
  17. virtus
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    ohhhh i see , wow i guess thats a nice way to think about it

    • one year ago
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