Probability · Question 11 · Medium
Probability question 11
The probability that Ritu solves a puzzle is 2/3 and that Sohan solves it is 3/5. If they try independently, what is the probability that the puzzle is solved?
- 2/5
- 4/5
- 11/15
- 13/15
Answer and explanation
Answer: D. 13/15
Explanation: It stays unsolved only if both fail: (1/3) × (2/5) = 2/15. So P(solved) = 1 − 2/15 = 13/15.
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