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

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:

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:

In how many ways cann a mixed doubles game in tennis be arranged from 5 married couples, if no husband and wife play in the same game?

The number of ways in which a mixed doubles tennis game can be arranged from 9 married couples:

The number of ways in which a mixed double game can be arranged from amongst 5 maried couples if at least one husband and wife play in the same game (A) 200 (B) 140 (C) 60 (D) none of these