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virtus

  • 3 years ago

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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  1. estudier
    • 3 years ago
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    A person can only shake the hand of 6 others.....

  2. virtus
    • 3 years ago
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    i don't think that is right

  3. smr_kml
    • 3 years ago
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    Thank you

  4. virtus
    • 3 years ago
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    for...

  5. smr_kml
    • 3 years ago
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    you know for what!

  6. mukushla
    • 3 years ago
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    C(2,7)=21

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

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

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

  10. higgs
    • 3 years ago
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    ^they can't shake hands twice

  11. virtus
    • 3 years ago
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    oh i see so why is it 7C2?

  12. virtus
    • 3 years ago
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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

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

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

  15. virtus
    • 3 years ago
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    why choose 2 from 7

  16. estudier
    • 3 years ago
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    2 people (ie 2 hands)

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

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