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Q.

If aN={ax/xN} . The set 3N7N=

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a

{3,6,9,12..}

b

{7,14,21,28,...}

c

{21,42,63,84,...}

d

{5,10,15,.....}

answer is C.

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Detailed Solution

3N={3,6,9,12,15,...}

7N={7,14,21,...}

3N7N= {21,42,...}

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