Probability · Question 24 · Medium
Probability question 24
Anu speaks the truth in 3 out of 4 cases and Bina in 4 out of 5 cases, independently. What is the probability that they contradict each other when stating the same fact?
- 7/20
- 13/20
- 1/20
- 3/5
Answer and explanation
Answer: A. 7/20
Explanation: They contradict when exactly one tells the truth: (3/4)(1/5) + (1/4)(4/5) = 3/20 + 4/20 = 7/20.
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