If ""^(n)P(3)=1320, find n....

If `""^(n)P_(3)=1320`, find n.

Text Solution

Verified by Experts

The correct Answer is:

`= 12xx11xx10=""^(12)P_(3)`
` therefore n =12`

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

A

(4,9)

B

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C

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