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In how many ways can a lawn tennis mixed...

In how many ways can a lawn tennis mixed double be made up from seven married couples if no husband and wife play in the same set?

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RD SHARMA ENGLISH-PERMUTATIONS-All Questions
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  8. Prove that: ((2n)!)/(n !)={1. 3. 5 (2n-1)}2^ndot

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  9. If (n !)/(2!(n-2)!) and (n !)/(4!(n-4)!) are in the ratio 2:1 , find t...

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  10. Find n , if (n+2)! =2550xxn !

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  11. If 1/(9!)+1/(10 !)=x/(11 !) , find xdot

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  12. Prove that: n(n-1)(n-2)....(n-r+1)=(n !)/((n-r)!)

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