i need to know how to solve it?
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the formula is
n(AUB)= n(A)+n(B)-n(A intersection B)
so 29=15+n(B)-7
n(B)= (29-15)+7
n(B)= 21
n(AUB)= n(A)+n(B)-n(A intersection B)
so 29=15+n(B)-7
n(B)= (29-15)+7
n(B)= 21
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