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anonymous

  • one year ago

4 people come to a party and shake hands with each other. If each person shakes the hand of every other​ person, how many handshakes​ occur?

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  1. anonymous
    • one year ago
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    @peachpi

  2. anonymous
    • one year ago
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    @phi @welshfella @Nnesha

  3. amilapsn
    • one year ago
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    3+2+1

  4. anonymous
    • one year ago
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    6

  5. anonymous
    • one year ago
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    lol

  6. amilapsn
    • one year ago
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    Lets assume the 4 people are ABC and D ok?

  7. anonymous
    • one year ago
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    ok

  8. anonymous
    • one year ago
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    hello

  9. amilapsn
    • one year ago
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    So A shakes hand with the three others: BC and D

  10. anonymous
    • one year ago
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    @peachpi

  11. anonymous
    • one year ago
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    ok

  12. anonymous
    • one year ago
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    ok

  13. amilapsn
    • one year ago
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    then B shakes hand with C and D

  14. anonymous
    • one year ago
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    kk

  15. anonymous
    • one year ago
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    kk

  16. amilapsn
    • one year ago
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    At last we have to add the shaking hand between C and D

  17. anonymous
    • one year ago
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    5 ?

  18. amilapsn
    • one year ago
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    So if we add all we get 3+2+1=?

  19. anonymous
    • one year ago
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    6

  20. amilapsn
    • one year ago
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    Right try sketching the situation :-)

  21. anonymous
    • one year ago
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    is that answer

  22. amilapsn
    • one year ago
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    yep

  23. amilapsn
    • one year ago
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    Like this:-) https://sketch.io/render/sketch55e0bed1ee9f1.png

  24. amilapsn
    • one year ago
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    How many double arrows are there?

  25. amilapsn
    • one year ago
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    They are the number of hand shakes :-)

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