If $n (A) = 115, n (B) = 326, n (A - B) = 47$ , then $n (A + B)$ is equal to

373

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165

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370

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None

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Solution

The correct option is A 373
$n (A - B) = 47 \Rightarrow n (A) - n (A \cap B) = 47 \Rightarrow n (A \cap B) = 115 - 47 = 68$

Hence $n (A + B) = 115 + 326 - 68 = 373$

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