Question

A={ ∶ is a prime number less than 10} and B={ ∶ is a odd number less

than 10}, find A Δ B.

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Answer 1

1. A={ x∶ x is a prime number less than 10}

=> A = { 2,3,5,7}

2. B={ x ∶ x is a odd number less than 10}

B = { 1,3,5,7,9 }

3. A - B = {2,3,5,7} - { 1,3,5,7,9 }

= { 2}

4. B - A = { 1,3,5,7,9} - { 2,3,5,7 }

= { 1,9}

Now,.

A ∆ B = ( A - B ) U ( B - A )

= { 2 } U { 1,9 }

= { 1,2,9 }

Therefore.,

A ∆ B = { 1, 2 ,9 }

•••♪