Question

If 9pr = 3024 ,find r

Answer 1

If 9Pr = 3024

Solution -

nPr = n!/(n-r)!

n = 9

Therefore, 9Pr = 9!/(9-r)! = 3024

(9-r)! = 9! / 3024

(9-r)! = 120

9 - r = 5

r = 9 - 5

r = 4

Answer 2

9Pr = 3024

9!/(9-r)! = 3024

(9-r)! = 9!/3024

(9-r)! = 120

(9-r)! = 5!

9-r = 5

r = 4

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