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The smallest ...

Question

The smallest set $A$ such that $A \cup {1, 2} = {1, 2, 3, 5, 9}$ is

A

{2, 3, 5}

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B

{3, 5, 9}

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C

{1, 2, 5, 9}

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D

{1, 2,}

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Solution

The correct option is B ${3, 5, 9}$
$A \cup {1, 2} = {1, 2, 3, 5, 9}$
Clearly $A$ should be ${3, 5, 9}$

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