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If ""^(56)P((r+6)):""^(54)P((r+3))=30800...

If `""^(56)P_((r+6)):""^(54)P_((r+3))=30800:1`, find r.

A

17

B

38

C

41

D

52

Text Solution

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The correct Answer is:
C
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AAKASH SERIES-PERMUTATIONS & COMBINATIONS-EXERCISE-II
  1. If ""^(n)P(5)+5.""^(n)P(4)=""^(10)P(r) then 'r' is

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  2. If ""^(n)P(r)=3024 then (n,r) is

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

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  11. The number of arrangements that can be formed out of GANESHPURI so tha...

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