1.

There are 20 pairs of shoes in a closet. Out of them 4 shoes are selected at random. The probability that there is exactly one pair among the 4 shoes is

Answer»

`(.^(20)C_(1)XX.^(38)C_(2))/(.^(20)C_(2))`
`(.^(20)C_(1)(.^(38)C_(2)-.^(19)C_(1)))/(.^(40)C_(4))`
`(.^(20)C_(1)(.^(38)C_(2)-.^(9)C_(1)))/(.^(20)C_(2))`
`(.^(20)C_(1)xx.^(38)C_(2))/(.^(40)C_(4))`

Answer :B


Discussion

No Comment Found

Related InterviewSolutions