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MikeyMaximum

  • one year ago

Ms. Lunette has 18 students in her class. She wants to send 3 of these students to pick up books for the class. How many combinations of 3 students can she choose? A. 6 B. 54 C. 816 D. 4896

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  1. MikeyMaximum
    • one year ago
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    I know for sure that the answer is not either A or D

  2. MikeyMaximum
    • one year ago
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    I think most likely C

  3. MikeyMaximum
    • one year ago
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    tbh I'm not sure

  4. imqwerty
    • one year ago
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    The number of ways of selecting 'r' number of different things from 'n' number of different things is nCr. So, here, Ms. Lunette has to select 3 different students from 18 different students. The Number of ways of doing so is 18C3 = 18!/3!(18-3)! = 18!/3!15! = (16 * 17 * 18) / (1 * 2 * 3) = 816. The answer is c.

  5. nincompoop
    • one year ago
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    can she repeat people?

  6. anonymous
    • one year ago
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    18C3 = 816

  7. MikeyMaximum
    • one year ago
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    Yes She can

  8. nincompoop
    • one year ago
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    then follow qwerty's concept

  9. MikeyMaximum
    • one year ago
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    ok Thx 2 all who came to help thou

  10. imqwerty
    • one year ago
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    ;)

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