A husband and a wife appear in an interview for two vaccancies in the same post. The probability of husband's selection is \(\frac{1}{7}\) and the probability of wife's selection is \(\frac{1}{5}.\) What is the probability that only one of them is selected?
1
\(\frac{4}{5}\)
2
\(\frac{2}{7}\)
3
\(\frac{8}{15}\)
4
\(\frac{4}{7}\)