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Question

If A = {x : x is a multiple of 3} and , B = {x :x is a multiple of 5}, then A - B is


A

AB

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B

A¯B

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C

¯A¯B

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D

¯¯¯¯¯¯¯¯¯¯¯¯¯¯AB

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Solution

The correct option is B

A¯B


A = {x : x is a multiple of 3}

A = {3,6,9,12,15,18,21,24,27,30,33,36,39,42,45,48,...}

B = {x : x is a multiple of 5}

B = {5,10,15,20,25,30,35,40,45,50,...}

Now, we have :

A - B = {3,6,9,12,18,21,24,27,33,36,39,42,48,...} = A¯B


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