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Question

Let $A equals left curly bracket x colon x blank$ is a multiple of 3 $right curly bracket$ and $B equals left curly bracket x colon x blank i s blank a blank m u l t i p l e blank o f blank 5 right curly bracket$ . Then, $A intersection B$ is given by

{3, 6, 9, ...…}
{5, 10, 15, 20, .......}
{15, 30, 45, ......}
None of these

The correct answer is: {15, 30, 45, ......}

$A intersection B equals open curly brackets x colon x blank a blank m u l t i p l e blank o f blank 3 close curly brackets a n d blank left curly bracket x colon x blank i s blank a blank m u l t i p l e blank o f blank 5 right curly bracket$
$equals left curly bracket x colon x blank i s blank a blank m u l t i p l e blank o f blank 15 right curly bracket$
$equals left curly bracket 15 comma blank 30 comma blank 45 comma horizontal ellipsis horizontal ellipsis horizontal ellipsis. right curly bracket$

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