# 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

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?

(a) Both books are to be on the same subject?

(b) The books are to be on different subjects?

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