Q6 of 195 Page 16

If P(9, r) = 3024, find r.

Given: P(9, r) = 3024


To find: value of r


We know,




So, according to question:


P(9, r) = 3024







⇒ (9 – r)! = 5!


⇒ 9 – r = 5


⇒ -r = 5 – 9


⇒ -r = -4


∴ The value of r = 4


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