A and B are two sets such that a union B has 18 elements if we has 8 elements and B has 15 elements then the number of elements in a intersection b will be
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n(A u B)= n(a) + n(b) -n(a intersection b)
18 = 8 + 15 - n(a intersection b)
n(a intersection b) = 5
n(A u B)= n(a) + n(b) -n(a intersection b)
18 = 8 + 15 - n(a intersection b)
n(a intersection b) = 5
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