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anthony~

  • one year ago

Find the number of ways to listen to 4 different CDs from a selection of 10 CDs.

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  1. seiga
    • one year ago
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    There are 15 x 14 x 13 x 12 ways to listen to 4 different CDs out of 15.

  2. satellite73
    • one year ago
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    i am wrong, @seiga is right

  3. anthony~
    • one year ago
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    theres are the answer choices: 151,200 5040 2880 720

  4. seiga
    • one year ago
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    --151,200 5040 2880 720 --solution: in this case the original answer should be ¹⁰C₄ = (10x9x8x7) / (1x2x3x4) = 210 but from options it is clear that it is used ¹⁰P₄ = 10x9x8x7 = 5040 in the question paper i m still sure that since it is not mentioned track wise or not. so it must be ¹⁰C₄ or 210 as answer. hope it would be helpful

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