Two mark exercise problems II — task. Mathematics State Board, Class 9.

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$U = \{x: x \in N, x \leq 10\}$ ,

$A = \{2, 3, 4, 8, 10\}$ and

$B = \{1, 2, 5, 8, 10\}$ , then verify that

$n(A \cup B) = n(A) + n(B) - n(A \cap B)$ .

Answer:

$n(A \cup B) =$ ---- (

$1$ )

$n(A) =$

$n(B) =$

$n(A \cap B) =$

$n(A) + n(B) - n(A \cap B) =$ ---- (

$2$ )

From equations (

$1$ ) and (

$2$ ), we have

$n(A \cup B) = n(A) + n(B) - n(A \cap B)$ .

Hence, we proved.

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6. Two mark exercise problems II