John lost his pen. The teacher started questioning students about the theft.
Catherine said, "Tom did it". Tom said, "Alex did it" while Martha said, "I did not do it" and Alex said, "Tom is lying
about me".
If only one of the following statements is true, which of the given options is correct?
Answers
Given : Statements :
Catherine said, "Tom did it",
Tom said, "Alex did it"
Martha said, "I did not do it"
Alex said, "Tom is lying about me".
only one of the statements is true
To Find : who stole pen ? who is lying
which of the given options is correct ?
Tom stole the pen and Catherine is right
Catherine stole the pen
Catherine is a liar and Alex is telling the truth
Martha did not do it, and is saying the truth
Solution:
Statements :
Catherine said, "Tom did it",
Tom said, "Alex did it"
Martha said, "I did not do it"
Alex said, "Tom is lying about me".
only one of the statement is True :
Note that : Tom said, "Alex did it" and Alex said, "Tom is lying about me".
These are contradicting statement and hence one of them is TRUE and another is FALSE
so we get one of the TRUE statement in these two
Hence Remaining two are FALSE
Catherine said, "Tom did it", - FALSE => Tom did not steal pen
Martha said, "I did not do it" - FALSE => Martha Stole pen
As Martha Stole pen hence Tom said, "Alex did it" is FALSE
Hence Alex said, "Tom is lying about me". is TRUE
Final Conclusions :
Alex said, "Tom is lying about me". is TRUE
Martha Stole pen
Catherine , Martha , Tom are liars
Out of given options :
Catherine is a liar and Alex is telling the truth
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