Two mark example problems I — task. Mathematics State Board, Class 9.

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$A = \{b, e, f, g\}$ and

$B = \{c, e, g, h\}$ , then verify the commutative property of (i) union of sets (ii) intersection of sets.

Answer:

(i) Union of sets:

$A$

$B =$

$\{i, i, i, i, i, i\}$ ---- (

$1$ )

$B$

$A =$

$\{i, i, i, i, i, i\}$ ---- (

$2$ )

From (

$1$ ) and (

$2$ ), we have:

Hence, the commutative property of union of sets is verified.

(Note: Enter the letters in alphabetical order.)

(ii) Intersection of sets:

$A$

$B =$

$\{i, i\}$ ---- (

$3$ )

$B$

$A =$

$\{i, i\}$ ---- (

$4$ )

From (

$3$ ) and (

$4$ ), we have:

Hence, the commutative property of intersection of sets is verified.

(Note: Enter the letters in alphabetical order.)

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1. Two mark example problems I