If $U = {1, 3, 5, 7, 9}$ and $A = {3, 5, 7}$ , then $(A^{'})^{'}$ is:

{3, 5, 7}

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{1, 9}

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{1, 3, 9}

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{1, 3, 5, 7, 9}

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Solution

The correct option is A ${3, 5, 7}$
The complement of the complement of a set is the set itself.
So, $(A^{'})^{'} = A$

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