6. For any married couple who are members of a tennis club, the probability that the husband has a degree is \(\frac { 3 } { 5 }\) and the probability that the wife has a degree is \(\frac { 1 } { 2 }\). The probability that the husband has a degree, given that the wife has a degree, is \(\frac { 11 } { 12 }\). A married couple is chosen at random.

1. Show that the probability that both of them have degrees is \(\frac { 11 } { 24 }\).
2. Draw a Venn diagram to represent these data. Find the probability that
3. only one of them has a degree,
4. neither of them has a degree. Two married couples are chosen at random.
5. Find the probability that only one of the two husbands and only one of the two wives have degrees.