Five different books are to be arranged horizontally on a bookshelf.(a)In how many ways can this be done? (b)If two are mathematics books and three are accounting books,in how many ways can all the books be arranged if the first two books are to be in mathematics?

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The Answer of Five different books are to be arranged horizontally on a bookshelf.(a)In how many ways can this be done? (b)If two are mathematics books and three are accounting books,in how many ways can all the books be arranged if the first two books are to be in mathematics?

Five Different Books Are to Be Arranged Horizontally on a Bookshelf.(a)In