A) \[N\subseteq W\]
B) \[|x+y|\le |x|+|y|\]
C) \[|x\times y|=|x|\times |y|\]
D) \[|x-y|\le |x|-|y|\]
Correct Answer: C
Solution :
\[ad,bc\in I,bc\ne 0\] \[a=\frac{p}{q},b=\frac{r}{s},c=\frac{l}{m}\]
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