A) 21 N
B) 10 N
C) 4 N
D) None of these
Correct Answer: A
Solution :
\[3N=\{x\in N:x\]is a multiple of 3} \[7N=\{x\in N:\]x is a multiple of 7} \\[3N\cap 7N\]\[=\{x\in \]is a multiple of 3 and 7} \[=\{x\in N:x\]is a multiple of 3 and 7} \[=\{x\in N:\]x is a multiple of 21}=21N.
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