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25 April, 10:41

Rafael is taking a test that contains a section of 12 true-false questions. how many of the possible groups of answers to these questions have exactly 8 correct answers of false?

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  1. 25 April, 11:07
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    Answer: There are 495 possible different sets of answers the could contain exactly 8 correct answers of false.

    Basically, we are looking for the number of different ways of selecting 8 objects out of a set of 12 objects. Our objects are answers of false and the set is the test.

    This is a combination problem. The formula would be:

    12! / (8! x 4!) = 495
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