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P(A)=People subscribing daily morning edition
P(B)=People subscribing the Sunday editions
P(AUB)=P(A)+P(B)-P(A Both B) ...........(1)
Given that P(AUB)=900; P(A)=700;and P(A both B)=400
From equation(1), we have
900=700+P(B)-400 ; P(B)=600
Thus People subscribing the sunday edition P(B) is 600.
Answer is "C"
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