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If ^2n+1P(n-1):^(2n-1)Pn=3:5,fin dndot...

If `^2n+1P_(n-1):^(2n-1)P_n=3:5,fin dndot`

A

4

B

6

C

3

D

8

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OBJECTIVE RD SHARMA ENGLISH-PERMUTATIONS AND COMBINATIONS-Exercise
  1. If ""^(n-1)C(3)+""^(n-1)C(4)gt""^nC(3), then

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  2. ""^(n)C(r)+2""^(n)C(r-1)+^(n)C(r-2) is equal to

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  3. If ^2n+1P(n-1):^(2n-1)Pn=3:5,fin dndot

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  4. If .^(35)C(n+7)=.^(35)C(4n-2) then find the value of n.

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  5. If .^(n)C(r )=84, .^(n)C(r-1)=36 " and" .^(n)C(r+1)=126, then find the...

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  6. If (n-1) C6 + (n-1)C7 > nC6 then

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  7. Which of the following is incorrect?

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  8. If ^(56)P(r+6):^(54)P(r+3)=30800 :1, find r.

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  9. The value of sum(r=0)^(m)""^(n+r)C(n) is equal to :

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  10. Every two persons shakes hands with each other in a party and the tot...

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  11. On the occasion if Deepawali festival, each student in a class sends g...

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  12. If ^n+2C8:^(n-2)P4: 57 : 16 , find ndot

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  13. Find the exponent of 3 in 100!

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  14. Ten different letters of an alphabet are given. Words with five letter...

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  15. If 7 points out of 12 are in the same straight line, then the number o...

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  16. about to only mathematics

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  17. No. of diagonals of a polygon are 170. No. of sides in this polygon ar...

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  18. The number of all possible selections of one or more questions from 10...

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  19. The number of ways of painting the faces of a cube with six diffe...

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  20. A box contains 4 white balls, 5 black balls and 2 red balls. The numbe...

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