Permutations and combinations, math, Mathematics

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

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If there are (2n+1)terms  in an AP ,prove that the ratio of the sum of odd terms and the sum of even terms is (n+1):n Ans:    Let a, d be the I term & Cd of the AP. ∴ ak =

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