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If ""^(n+1)C(3)=4(""^(n)C(2)), then n is...

If `""^(n+1)C_(3)=4(""^(n)C_(2))`, then n is equal to

A

12

B

10

C

16

D

11

Text Solution

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The correct Answer is:
D
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AAKASH SERIES-PERMUTATIONS & COMBINATIONS-PRACTICE EXERCISE
  1. ""^(14)C(4)+sum(j=1)^(4)""^((18-j))C(3) is equal to

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  2. If p and q are the greatest values of ""^(2n)C(r) and ""^(2n-1)C(r) re...

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  3. If ""^(n+1)C(3)=4(""^(n)C(2)), then n is equal to

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  4. ""^(2n)C(2)-2""^(n)C(2)=

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  5. The least positive integral value of x which satisfies the inequality ...

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  6. The least value of the natural numbar 'n' satisfying C(n,5)+C(n,6)gtC(...

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  7. If ""^(n)C(r-1):""^(n)C(r):""^(n)C(r+1)=2:4:5 then (n,r) is

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  8. ""^(n) C(r-1) = 330 ,""^(n)C(r)=462 , ""^(n)C(r+1) = 462 implies r=

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  9. ""^(37)C(4)+sum(r=1)^(5)(42-r)(C(r))=

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  10. The number of ways that 3 English, 3 Hindi & 3 Telugu books can be cho...

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  11. The number of ways can 5 red and 4 white balls be drawn from a bag con...

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  12. Every body in a room shakes hands with every body else. The total numb...

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  13. Let A be the set of 4-digit numbers a(1)a(2)a(3)a(4) where a(1)gta(2)g...

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