If an \( =\{a x: x \in N\} \), then \( 3 N \cap 7 N= \)
(A) \( 3 \mathrm{~N} \)
(B) \( 7 \mathrm...
If an \( =\{a x: x \in N\} \), then \( 3 N \cap 7 N= \)
(A) \( 3 \mathrm{~N} \)
(B) \( 7 \mathrm{~N} \)
(C) \( \mathrm{N} \)
(D) \( 21 \mathrm{~N} \)
\( \mathrm{P} \)
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