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The probability that A speaks truth is (...

The probability that A speaks truth is `(4)/(5)`, while this probability for B is `(3)/(4)`. The probability that they contradict each other when asked to speak on a fact is

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`P(barA).P(B)+P(A).P(barB)`
`=(1-4/5)(3/4)+(4/5)(1-3/4)`
`=3/20+4/20=7/20`
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