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There are 5 fictions and 6 non-fictions. How many cases are

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by Max@Math Revolution » Wed Apr 27, 2016 5:51 am
There are 5 fictions and 6 non-fictions. How many cases are there such that 2 fictions and 2 non-fictions are selected from them?

A. 90
B. 120
C. 150
D. 180
E. 200

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by Max@Math Revolution » Wed May 04, 2016 6:45 am
5C2*6C2=(5)(4)/2!(6)(5)/2!=150
Hence, the correct answer is C.

- Forget conventional ways of solving math questions. In DS, Variable approach is the easiest and quickest way to find the answer without actually solving the problem. Remember equal number of variables and independent equations ensures a solution.
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