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

If `""^(n)P_(r)=3024` then (n,r) is

A

(4,9)

B

(9,4)

C

(9,6)

D

(6,9)

Text Solution

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The correct Answer is:
B
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AAKASH SERIES-PERMUTATIONS & COMBINATIONS-EXERCISE-II
  1. 1+1.1!+2.2!+3.3!+.......+n.n! is equal to

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  2. If ""^(n)P(5)+5.""^(n)P(4)=""^(10)P(r) then 'r' is

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

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

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