Posted by jasz on Thursday, June 14, 2012 at 12:18pm.
If you mean
n(B) = 17, n(A∪B) = 30, and n(A∩B) = 4
Then since
n(A∪B) = n(A)+n(B)-n(A∩B)
30 = n(A) + 17 - 4
n(A) = 17
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