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A brother and sister appear for an interview against two vacant posts in an office. The probability of the brother’s selection is 1/5 and that of the sister’s selection is 1/3. What is the probability that one of them is selected?
1/5
2/5
1/3
2/3
Probability that only one of them is selected
= (prob. that brother is selected) × (prob. that sister is not selected) + (Prob. that brother is not selected) × (Prob. that sister is selected)
= (1/5 x 2/3) + (4/5 x 1/3) = 2/5
Hence, option 2 is the correct answer.
By: Amit Kumar ProfileResourcesReport error
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