A) $ x\in [ 1,3 ] $
B) $ x\in (1,3) $
C) $ x\in [ -1,3 ) $
D) $ x\in (-1,3) $
Correct Answer: A
$ | x-2 |\le 1 $
$ \Rightarrow -1\le x-2\le 1 $
$ \Rightarrow 1\le x\le 3 $
$ \Rightarrow x\in [1,3] $
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