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 If aN={ax:xN}, then the set 3N7N is 

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By Expert Faculty of Sri Chaitanya
a
21N
b
10N
c
4N
d
None of these

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detailed solution

Correct option is A

3N={x∈N:x is a multiple of 3}7N={x∈N:x is a multiple of 7}3N∩7N={x∈N:x is a multiple of 3 and 7} ={x∈N:x is a multiple of 21}=21N


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