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  4. If aN = ax: x ∈ N then 3N ∩ 7N =

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Q. If $aN = \{ax : x \in N \}$, then $3N \cap 7N = $

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Solution:

$3N\cap7N = \left\{21,42,63...\right\} $
$= \left\{21x:x \in N\right\} =21N$