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26 May, 08:18

How many ways are there to arrange 6 books on a shelf, if the 4 science books must be grouped together and the 2 english books must be grouped together?

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  1. 26 May, 08:25
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    The science books can be placed before or after the English books, so that’s two ways science-English or English-science.

    There are 24 ways to arrange the 4 science books and 2 ways to arrange the English books.

    So we have 24*2+2*24=96.
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