If \( A=\{x: x=4 n+1, n \leq 5, n \in N\} \) and \( B=\{3 n: n \leq 8, n \in N\} \), then \( A-(...
If \( A=\{x: x=4 n+1, n \leq 5, n \in N\} \) and \( B=\{3 n: n \leq 8, n \in N\} \), then \( A-(A-B) \) is :
(A) \( \{9,21\} \)
(B) \( \{9,12\} \)
(C) \( \{6,12\} \)
(D) \( \{6,21\} \)
\( \mathrm{P} \)
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