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Questions › DSE › DSE 2009 › Q30
2 marksMathematics › Logic and proof techniques › Logical reasoning puzzlesHardabout 4 min

DSE 2009 Question 30: Logic and proof techniques

There are 3 persons A, B and C. One is a Truth-teller (always truthful), one a Liar (always lies), and the third a Normal person (sometimes lies, sometimes not); each knows the others' types. A said: 'I am a normal person.' B said: 'A and C sometimes tell the truth.' C said: 'B is a normal person.'

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Logic and proof techniques has come up 73 times in 3 exams since 2004.

What this question tests

This question is on Logical reasoning puzzles, part of Logic and proof techniques in Mathematics.

Deduction problems that ask what must follow from a set of constraints.

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Practise Logic and proof techniquesMore on Logical reasoning puzzles

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Question from the DSE 2009 paper. Solutions are TestStop's own. Not affiliated with or endorsed by any examination authority.