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Haruhi

How many different 12-member juries can be chosen from a pool of 40 people? I really can't understand this.

  • 11 months ago
  • 11 months ago

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  1. .Sam.
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    40C12?

    • 11 months ago
  2. mathslover
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    And : \(\large ^n C_r = \cfrac{n!}{r! (n-r)!} \)

    • 11 months ago
  3. mathslover
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    @Haruhi , can you solve it now?

    • 11 months ago
  4. Haruhi
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    not really. I've been trying to solve it that way all this time. I'm getting weird results.

    • 11 months ago
  5. .Sam.
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    From \[\large ^n C_r = \cfrac{n!}{r! (n-r)!} = \frac{40!}{12!(40-12)!} = \frac{40 \times 39 \times 38 \times...}{(12 \times 11 \times 10 \times ...)(28 \times 27 \times 26 \times ...)}\]

    • 11 months ago
  6. .Sam.
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    Or just use a calculator

    • 11 months ago
  7. .Sam.
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    What do you get?

    • 11 months ago
  8. Haruhi
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    I get 1.5186643e+48 (whatever that means) and my options are a) 3,586,853,480 b) 4,586,853,480 c) 5,586,853,480 d) 6,586,853,480

    • 11 months ago
  9. .Sam.
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    Lol you should get 5,586,853,480 check your calculator

    • 11 months ago
  10. Zarkon
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    type "calculate 40 choose 12" into google

    • 11 months ago
  11. .Sam.
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    Ahh

    • 11 months ago
  12. Zarkon
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    it will take "40 choose 12" and give the answer

    • 11 months ago
  13. RolyPoly
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    I think we don't have Google in the exam!?

    • 11 months ago
  14. Haruhi
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    Ok..... still confused. How can a calculator be wrong lol what the hell am I doing

    • 11 months ago
  15. RolyPoly
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    Try:\[\frac{40!}{(12!(40-12)!)} \]

    • 11 months ago
  16. Ninagf99
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    That is wrong all of you I think its 12 times 40 its simple probability i think

    • 11 months ago
  17. Ninagf99
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    No nevermind

    • 11 months ago
  18. Ninagf99
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    Its c

    • 11 months ago
  19. Haruhi
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    It's the right answer, yeah. But it's damn confusing having to work with numbers like 815,915,279,999,999,744,392,488,672,368,848,648,400,776,424,296 -_- so I must've made a mistake at some point.

    • 11 months ago
  20. Ninagf99
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    please dont say dam on a post there are 7th graders in geometry and algebra 2 like me who don't like that

    • 11 months ago
  21. Haruhi
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    ok... >_>

    • 11 months ago
  22. Ninagf99
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    What is that supposed to mean

    • 11 months ago
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