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Maths-

General

Easy

Question

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 in test-II. How many students passed in both tests?

21
7
28
14

The correct answer is: 7

Use $n open parentheses A union B close parentheses equals n open parentheses A close parentheses plus n open parentheses B close parentheses minus n left parenthesis A intersection B right parenthesis$

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