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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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