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'Weekly Problem 34 - 2014' printed from

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Pierre said, "Just one of us is telling the truth".
Qadr said, "What Pierre says is not true".
Ratna said, "What Qadr says is not true".
Sven said, "What Ratna says is not true".
Tanya said, "What Sven says is not ture".

How many of them were telling the truth?

This problem is taken from the UKMT Mathematical Challenges.

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