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A husband and wife appear for an intervi...

A husband and wife appear for an interview for two vacancies in the same post. The probability of husband's selection is `(1)/(7)` and wife's rejection is `(4)/(5)` Find the probability that
i. both of them are selected.
ii. only one of them is selected.
iii. none of them is selected.
iv. atleast one of them is selected.

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