What color shirt is Andrew wearing ?
There are two men.
One of them is wearing a red shirt,
and the other is wearing a blue shirt.
The two men are named Andrew and Bob,
but we do not know which is Andrew and which is Bob.
The guy in the blue shirt says, "I am Andrew."
The guy in the red shirt says, "I am Bob."
If we know that at least one of them lied, then
What color shirt is Andrew wearing ?
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The Question says, atleast 1 of them is lying.So both of them can lie.
So here only 1 cannot lie as per their statements, so Both are lying
and thus Andrew is wearing a Red color shirt.