Number of ways in which a lawn-tennis mixed double be made from seven married couples if no husband and wife play in the same set is a. `240` b. `420` c. `720` d. none of these

In how many ways can a lawn tennis mixed double be made up from seven married couples if no husband and wife play in the same set?

The number of ways in which a mixed doubles game can be arranged from 9 married couples if no husband and wife play in the same game is:

The number of ways in which a mixed double game can be arranged from amongst 9 married couples if no husband and wife play in the same game is

The number of ways that a mixed doubles tennis game can be arranged from 7 married couples if no husband and wife play in the same game is

If the number of ways in which a lawn-tennis mixed double be made from seven married couples if no husband and wife play in the same set is K , then greatest prime divisor of K is __________.

If the number of ways in which a lawn-tennis mixed double be made from seven married couples if no husband and wife play in the same set is K , then greatest prime divisor of K is __________.

The number of ways in which a mixed double tennis game can be arranged from amongst 9 married couple if no husband & wife plays in the same game is:

The number of ways in which a mixed double tennis game can be arranged from amongst 9 married couple if no husband & wife plays in the same game is: