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Option 2 : P
Statement of S: Only one of us is telling the truth.
As, given in the question 'S' is telling the truth.
Let, us suppose that
T is telling the truth,
that means R is telling the truth.
and according to R, we know that P did not copy in the exam.
But if T is telling the truth then that means, R is also telling the truth and then that means 2 of them are telling the truth, which is not possible. Hence T is not telling the truth and hence R is not truthful as well.
" P did not copy in the exam" is hence false.
Which means "P did copy in the exam".
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