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P(AnB)=P(A)+P(B)-P(AuB)
P(B)=1-P(B')
P(B)=1-3/4=1/4
P(AnB)=1/2+1/4-5/8=4/8+2/8-5/8=1/8
P(B) = 1 -P(B') = 1/4
P(AnB) = P(A)+P(B) - P(AuB) = 1/2 +1/4 - 5/8 = 4/8 + 2/8 - 5/8 = 1/8
P(AnB) = 1/8