Who Vandalized the venue?
There were 5 people at a party one night. The owners of the party venue discovered that someone drew on the wall. Two people lied, and three people told the truth. Riley said, "Eric did it". Eric said, "I didn't do it". Frank said, "Eric did it". Thomas said, "Jeff did it". Jeff said, "I didn't do it". Who vandalized the venue?
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Riley accuses Eric so Eric defends himself.
Frank accuses Eric while Thomas accuses Jeff.
These above account for 2 truths and 2 lies between them, for the pairs are both opposite in nature.
The third truth can only be Jeff's "I didn't do it".
==> Eric is guilty of vandalising the venue.