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  1. Gunther wank's in the coffee shop and found out that his coffee machine is broken and found that there are only three girls around.
    > Rachel says Monica did it
    > Monica says Rachel is lying
    > Phoebe says she did not.

    Only one of them is telling the truth. Who broke the coffee machine?

  2. Answer : Phoebe broke the machine and Monica is telling the truth.

    Explanation :

    > Rachel says Monica did it
    If this is true, then the last statement must be true as well.

    > Monica says Rachel is lying

    > Phoebe says she did not.
    If this is true, then one of the first two statements must be true as well.


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