Discussion

Explanation:

Two men can be selected in 9C2 ways.

After selecting two men, two women can be selected in 7C2 ways from (9 – 2 = 7) women, so that no husband and wife play in the same set.

Also, these selected 4 people can be grouped in 2 ways.

∴ The total number of mixed double teams

9C×7C× 2 = 1512

Hence, option (a).

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