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anonymous

  • 5 years ago

how many different comminities can be formed from 12 teachers, and 40 students, if the commitie consists 3 teachers and 4 students? In how many ways can the commitie of 7 members be selected?

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  1. anonymous
    • 5 years ago
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    find each seaprately (teachers and students) in the same way you have been, then multiply the two answers that you get.

  2. anonymous
    • 5 years ago
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    and then how does 7 come in?

  3. anonymous
    • 5 years ago
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    I keep getting a decimal for a number :/

  4. anonymous
    • 5 years ago
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    i can show u what I did

  5. anonymous
    • 5 years ago
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    out of 12 teachers you choose 3 = 12C3 and out of 40 students you choose 4 = 40C4

  6. anonymous
    • 5 years ago
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    Do those separately, then multiply the answers you get

  7. anonymous
    • 5 years ago
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    No decimals should show up

  8. anonymous
    • 5 years ago
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    for the 40 students is it 40*39*38*37?

  9. anonymous
    • 5 years ago
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    or is that when u do the 4?

  10. anonymous
    • 5 years ago
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    for Choosing when order doesn't matter, do 40*39*38*37 and then divide by 4*3*2*1 Similar for the teachers

  11. anonymous
    • 5 years ago
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    teachers is 12*11*10 divided by 3*2*1 --> notice that you get the same number of factors in the numerator as the denominator

  12. anonymous
    • 5 years ago
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    ok so now i got 91390 and then for the teachers 220

  13. anonymous
    • 5 years ago
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    multiply for a very large number

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