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In a group of...

Question

In a group of students, 50 students passed in English, 60 students passed Mathematics and 40 students passed in both. Find the number of students who passed either in English or in Mathematics.

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Solution

Since, $n (A \cup B) = n (A) + n (B) - n (A \cap B)$ , we have
Number of students who passed either in English or Math $= 50 + 60 - 40 = 70$

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