If \[aN=\{ax:x\in N\},\] then the set \[3N\cap 7N\] is

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

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If \[aN=\{ax:x\in N\},\] then the set \[3N\cap 7N\] is

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