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Use the Addition Principle for Counting to Solve the Problem $\cap$

Question 48

Multiple Choice

Use the addition principle for counting to solve the problem:
-If n(B) = 24, n(A $\cap$ B) =5, and n(A $\cup$ B) = 42, find n(A) .

A) 23
B) 24
C) 25
D) 21

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