Need math help: how many subscribe to the Sunday edition?

Mathematics
Tutor: None Selected Time limit: 1 Day

A survey of 900 subscribers to the Los Angeles Times revealed that 700 people subscribe to the daily morning edition and 400 subscribe to both the daily and the Sunday editions.How many subscribe to the Sunday edition?
A.
B.
C.
D.
E.
F.
Nov 15th, 2015

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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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Nov 15th, 2015

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Nov 15th, 2015

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