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

16. 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

  1. both books are to be on the same subject?
  2. the books are to be on different subjects?

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