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In a class, 70 students wrote two tests, viz., Test-I and Test-II. 50% of the students failed in Test-I and 40% of the students failed in Test-II. How many students passed in both the tests?

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answer is B.

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Detailed Solution

n(A ∪ B) = n(A) + n(B) - n(A ∩ B).

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