A choir director must select six hymns for a Sunday church service. She has three hymn books,

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A choir director must select six hymns for a Sunday church service. She has three hymn books, each containing 25 hymns (there are 75 different hymns in all). In how many ways can she select the hymns if she wishes to select
(a) Two hymns from each book?
(b) At least one hymn from each book?
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