Use the addition principle for counting to solve the problem.If n(A) = 40, n(B) = 117 and n(A ? B) = 137, what is n(A ? B)?
A. 20
B. 40
C. 22
D. 10
Answer: A
Mathematics
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A. 4xex + 1 B. (x + 4)ex + 1 C. 2x + 5 D. ex + 4x + 1
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A. f(x) = 
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