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3 February, 21:17

Julie owns 8 different mathematics books and 5 different computer science books and wish to fill 5 positions on a shelf. if the first 3 positions are to be occupied by math books and the last 2 by computer science books, in how many ways can this be done?

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  1. 3 February, 23:10
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    Each number being multiplied represents the number of choices of books for each slot on the shelf.

    8 x 7 x 6 x 5 x 4 = 6720 ways

    first 3 slots 8, 7,6 choices of math ... number goes down by one because the previous slot was filled. last 2 slots 5, 4 choices of science books
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