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1 . You are given 5 books and 7 bookshelves. How many ways are there to place these books on the shelves? (The order on the shelves matters.)

(a)

$\frac{11!}{6!}$

(b)

$\frac{12!}{7!}$

(c)

${7}\choose{5}$

(d)

$\frac{11!}{7!}$