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If (n !)/(2!(n-2)!) and (n !)/(4!(n-4)!)...

If `(n !)/(2!(n-2)!) and (n !)/(4!(n-4)!)` are in the ratio `2:1` , find the value of `ndot`

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RD SHARMA ENGLISH-PERMUTATIONS-All Questions
  1. Prove that (n !+1) is not divisible by any natural number between 2 a...

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  2. Prove that: ((2n)!)/(n !)={1. 3. 5 (2n-1)}2^ndot

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

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

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

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

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  7. If w(1).w(2),w(3) and w(4) are work done in isothermal, adiabatic, iso...

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  8. How many permutations of the letters of the word MADHUBANI do not b...

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  9. Find the probability that in a random arrangement of the letters of th...

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  10. How many numbers can be formed with the digits 1, 2, 3, 4, 3, 2, 1 so ...

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  11. If the letters of the word ‘MOTHER’ are written in all possible orders...

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  12. In how many ways can the letters of the word PERMUTATIONS be arrange...

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  13. In how many ways can the letters of the word PERMUTATIONS be arrang...

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  14. (i) How many different words can be formed with letters of the word ‘S...

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  15. How many words can be formed using the letter A thrice, the letter B ...

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  16. How many 5 letters words can be formed using the letters of the words ...

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  17. m men and n women ae to be seated in a row so that no two women sit...

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  19. How many three-digit numbers more than 600 can be formed by using the ...

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