self Maths Puzzle

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

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self Other Question

en different alphabets are given. Words containing five alphabets are to be formed from them. Find the number of words which have exactly one alphabet repeats? Sixteen persons are to be seated along two sides of a rectangular table with eight chairs on either side. Of these sixteen, Amit, Jaya, Rishi and Neetu with to sit on one side of the table, while Paresh and Sadashiv with to sit on the other, in how many ways can the arrangement be done?