In a survey of university students, 64 had taken mathematics course, 94 had taken chemistry
course, 58 had taken physics course, 28 had
taken mathematics and physics, 26 had taken
mathematics and chemistry, 22 had taken
chemistry and physics course, and 14 had taken
all the three courses. Find how many had taken
one course only.

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step-by-step explanation:

no, her answer is not correct.   we square the lengths of all sides and then determine whether the pythagorean theorem holds here:

9² + 15² = 306.   this is not equal to the square of the longest side ( that square being 395.   answer c is correct.