A speaks truth in 75% of cases and B in 80% of the cases. In what percentage of cases are they likely…
The correct choice is: “35%” They contradict each other when exactly one of them tells the truth. P(A true, B false) = 0.75 × 0.20 = 0.15; P(A false, B true) = 0.25 × 0.80 =…
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A speaks truth in 75% of cases and B in 80% of the cases. In what percentage of cases are they likely to contradict each other, narrating the same incident?
Answer and explanation
Correct answer C
The correct choice is: “35%”
They contradict each other when exactly one of them tells the truth.
P(A true, B false) = 0.75 × 0.20 = 0.15; P(A false, B true) = 0.25 × 0.80 = 0.20.
Total = 0.15 + 0.20 = 0.35, i.e. 35% of cases.
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