there are 12 books on algebra and calculus in a library ,the books on the same subject being different . if the numbr of selections each of whish consists 3 buks on each topic is greatest, then the numbr of books of algebra and calculus in the library is.........
a.3 & 9 b.4 & 8 c.5 & 7 d..6 & 6

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Since the group of 3 books can be found by combination, why don't we use that ?

because there are 3 ways to choose an alg. book and 9 ways to choose a calc. book.

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