SOLUTION: Can someone explain this to me, please? If n(B) = 17, n(A ∪ B) = 25, and n(A ∩ B) = 6, find n(A)

SOLUTION: Can someone explain this to me, please? If n(B) = 17, n(A ∪ B) = 25, and n(A ∩ B) = 6, find n(A)

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Question 921210: Can someone explain this to me, please?
If n(B) = 17, n(A ∪ B) = 25, and n(A ∩ B) = 6, find n(A)
Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!
n(A or B) = n(A) + n(B) - n(A and B)
n(A) = n(A or B) - n(B) + n(A and B)
n(A) = 25 - 17 + 6 = 14

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