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MathNet 2016-part-05 — 184 problems (EN–VI) Question 131

Math Olympiad Vault · MathNet 2016-part-05 — 184 problems (EN–VI)

Question 131

Devious Steve either lies for the whole day or tells the truth for the whole day. Which one of the following statements can he never say?
(A) "Yesterday I told the truth"
(B) "Yesterday I lied"
(C) "Today I am telling the truth"
(D) "Today I am lying"
(E) "Tomorrow I shall lie"