If $aN = \{ ax:x \in N\} ,$ then the set $3N \cap 7N$ is .....$N$
If $aN = \{ ax:x \in N\} ,$ then the set $3N \cap 7N$ is .....$N$
- A
$21$
- B
$10$
- C
$4$
- D
None of these
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