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- Feb 19th 2011, 02:33 AM #1

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## Kangaroo question??

26. A test is composed of ten questions each of which must be answered “a” or “b”. If you answer

any 5 questions „a” and any 5 questions „b”, the number of correct answers is guaranteed to be

at least 4. How many answer keys are there with this property?

A) 5^5 B) 252 C) 2 D) 10 E) 22

- Feb 19th 2011, 07:01 AM #2

- Feb 19th 2011, 07:15 AM #3

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