A) 4
B) 8
C) 18
D) 16
Correct Answer: D
[d] $ n(A)=2 $ and $ n(B)=2 $ $ n(A\times B)=n(A)\times n(B)=2\times 2=4 $
$ \therefore $ Number of subset of $ A\times B={2^{n(A\times B)}} $ $ =2^{4}=16 $
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