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

Number of ways in which a lawn-tennis mixed double be made from seven

1.	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
Answer» C. 720

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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

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