There are 10 fictions and 6 non-fictions. How many cases are there such that 2 fictions and 2 non-fictions are selected from them?\nOptions:\n(A) 90\n(B) 120\n(C) 675\n(D) 180\n(E) 200 Now, let's think a bit. Some random thoughts:
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Number of ways of selecting 2 fiction books = 10C2\nNumber of ways of selecting 2 non fiction books = 6C2\n10C2 * 6C2 = 45 * 15 = 675
The final answer: (C).
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