Question: A student has to sell 2 books from a collection of 6 math, 7 science, and 4 economics books. How many choices are possible if

A student has to sell 2 books from a collection of 6 math, 7 science, and 4 economics books. How many choices are possible if
(a) Both books are to be on the same subject?
(b) The books are to be on different subjects?

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