Francesca has 20 different books but the shelf in her dormitory residence will hold only 12 of

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Francesca has 20 different books but the shelf in her dormitory residence will hold only 12 of them.
(a) In how many ways can Francesca line up 12 of these books on her bookshelf?
(b) How many of the arrangements in part (a) include Francesca's three books on tennis?
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