Two marks exercise problems I — task. Mathematics State Board, Class 9.

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1. If

$n(A) = 25$ ,

$n(B) = 40$ ,

$n(A \cup B) = 50$ and

$n(B') = 25$ , find

$n(A \cap B)$ and

$n(U)$ .

$n(A \cap B)$

$=$

$n(U)$

$=$

2. If

$n(A) = 300$ ,

$n(A \cup B) = 500$ ,

$n(A \cap B) = 50$ and

$n(B') = 350$ ,

$n(B)$ and

$n(U)$ .

$n(B)$

$=$

$n(U)$

$=$

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