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In how many different ways can 6 books be arranged on a shelf if one of the books, book X, has to be first?

In how many different ways can 6 books be arranged on a shelf if one of the books, book X, has to be first?
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In how many different ways can 6 books be arranged on a shelf if one of the books, book X, has to be first?

User Avatsav
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6x6=36 but book X has to be first so 36-(5x5)=36-25=11

User Idog
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