anonymous
  • anonymous
How many different 12-member juries can be chosen from a pool of 40 people? I really can't understand this.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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.Sam.
  • .Sam.
40C12?
mathslover
  • mathslover
And : \(\large ^n C_r = \cfrac{n!}{r! (n-r)!} \)
mathslover
  • mathslover
@Haruhi , can you solve it now?

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anonymous
  • anonymous
not really. I've been trying to solve it that way all this time. I'm getting weird results.
.Sam.
  • .Sam.
From \[\large ^n C_r = \cfrac{n!}{r! (n-r)!} = \frac{40!}{12!(40-12)!} = \frac{40 \times 39 \times 38 \times...}{(12 \times 11 \times 10 \times ...)(28 \times 27 \times 26 \times ...)}\]
.Sam.
  • .Sam.
Or just use a calculator
.Sam.
  • .Sam.
What do you get?
anonymous
  • anonymous
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
.Sam.
  • .Sam.
Lol you should get 5,586,853,480 check your calculator
Zarkon
  • Zarkon
type "calculate 40 choose 12" into google
.Sam.
  • .Sam.
Ahh
Zarkon
  • Zarkon
it will take "40 choose 12" and give the answer
anonymous
  • anonymous
I think we don't have Google in the exam!?
anonymous
  • anonymous
Ok..... still confused. How can a calculator be wrong lol what the hell am I doing
anonymous
  • anonymous
Try:\[\frac{40!}{(12!(40-12)!)} \]
anonymous
  • anonymous
That is wrong all of you I think its 12 times 40 its simple probability i think
anonymous
  • anonymous
No nevermind
anonymous
  • anonymous
Its c
anonymous
  • anonymous
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.
anonymous
  • anonymous
please dont say dam on a post there are 7th graders in geometry and algebra 2 like me who don't like that
anonymous
  • anonymous
ok... >_>
anonymous
  • anonymous
What is that supposed to mean
anonymous
  • anonymous
weirdos

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