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Question

How many liked folk music but not rock music?

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Solution

Number of audience who like rock music, n(R)=114
Number of audience who like folk music,n(F)=50
Number of audience who like classical music,n(C)=41
n(RF)=14
n(RC)=15
n(CF)=11
n(RFC)=5
Number of audience who like folk music but not rock music=n(R)n(RF)=11414=100

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