Question

If the universal set is U = { 1, 2, 3, 4,5}and A={xlx is a prime factor of 420} then write the set A in the Tabular form​

SPEP BY STEP EXPLANATION.

Answer 1

Answer:

A= ( 2, 3,5 )

as 1 is neither prime norcomposite and 4 is not a prime factor of 420

Answer 2

Answer:

Given, universal set, U={1,2,3,4,5,6,7}

A={1,2,5,7}

B={3,4,5,6}

(A∪B)

′

=U−(A∪B)

={1,2,3,4,5,6,7}−{1,2,3,4,5,6,7}

=ϕ

A

′

∩B

′

=(U−A)n(U−B)

={3,4,6}n{1,2,7}

=ϕ

Hence (A∪B)

′

=A

′

∩B

′

.

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