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anonymous

  • one year ago

Robert wants to arrange the books for Statistics, Calculus, Geometry, Algebra, and Trigonometry on a shelf. In how many arrangements can he keep them on the shelf such that the Algebra and Trigonometry books are not together?

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  1. anonymous
    • one year ago
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    @ganeshie8

  2. anonymous
    • one year ago
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    I think the answer is 24

  3. ganeshie8
    • one year ago
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    24 is the number of arrangements such that Algebra and Trigonometry books are together

  4. anonymous
    • one year ago
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    no, 120 would be. wouldnt it?

  5. ParthKohli
    • one year ago
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    Why would he not want to keep them together?

  6. ParthKohli
    • one year ago
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    How picky can someone be?

  7. ganeshie8
    • one year ago
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    120 is the total arrangements

  8. ParthKohli
    • one year ago
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    Number of ways to arrange the books - number of ways to keep them together

  9. anonymous
    • one year ago
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    Lol right. it just to make me do more work.

  10. ganeshie8
    • one year ago
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    lol

  11. anonymous
    • one year ago
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    So based off what @ParthKohli just said the answer would be like 96?

  12. ParthKohli
    • one year ago
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    Indeed.

  13. anonymous
    • one year ago
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    That is not one of the choices though :/

  14. ganeshie8
    • one year ago
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    Now thats interesting, how many of each type of books are there ?

  15. anonymous
    • one year ago
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    it says just one of each of the 5

  16. ganeshie8
    • one year ago
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    try 5! - 2*4! = 72

  17. ParthKohli
    • one year ago
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    Oh yes.

  18. anonymous
    • one year ago
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    so its 72?

  19. ganeshie8
    • one year ago
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    Yes does that make sense

  20. anonymous
    • one year ago
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    Yeah. I just did it a different way. thats why I was off thanks!

  21. ganeshie8
    • one year ago
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    np

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