SOLUTION: Need help: Use the union rule to answer the question. If n(A) = 5, n(B) = 11, and n(A ∩ B) = 3; what is n(A u B)? A) 14 B) 16 C) 13 D) 12

SOLUTION: Need help: Use the union rule to answer the question. If n(A) = 5, n(B) = 11, and n(A ∩ B) = 3; what is n(A u B)? A) 14 B) 16 C) 13 D) 12

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Question 202061: Need help:
Use the union rule to answer the question.
If n(A) = 5, n(B) = 11, and n(A ∩ B) = 3; what is n(A u B)?
A) 14
B) 16
C) 13
D) 12

Answer by user_dude2008(1862) (Show Source): You can put this solution on YOUR website!
n(A u B) = n(A) + n(B) - n(A ∩ B)

n(A u B) = 5 + 11 - 3

n(A u B) = 16 - 3

n(A u B) = 13

Ans: C) 13
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