Axe speaks truth only when Wye does not speak truth, then what is the probability that Zed does not speak truth on a question?
Case (1) : Wye does not speak truth So, Axe speaks truth here Probability that Zed does not speaks truth = 7/20 ×(1-3/5)×(1-5/6) = 7/300 Case (2) : Wye speaks truth So, Axe does not speaks truth here Probability that Zed does not speaks truth = (1-7/20)× 3/5 ×(1-5/6) = 13/200 Required Probability = 7/300+ 13/200 = 53/600
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