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In a survey of 100 persons, 60 read newspaper A, 50 read newspaper B and 40 read newspaper C. Also, 30 read both A and B, 20 read both B an…

1607Medium DSSSB TGT Computer Science 0 replies 1 views

In a survey of 100 persons, 60 read newspaper A, 50 read newspaper B and 40 read newspaper C. Also, 30 read both A and B, 20 read both B and C, 15 read both A and C, and 10 read all three. How many persons read none of the three newspapers?

Correct answer: C

Explanation

By inclusion–exclusion, n(A∪B∪C) = 150 − 65 + 10 = 95, so 100 − 95 = 5 persons read none.

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