Question

If P(5, r) = P(6, r - 1), then find 'r'.​

Answer 1

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Answer 2

Answer:

P(5,r)=P(6,r−1)

⇒ (5−r)5={6−(r−1)}6

⇒ (5−r)5=(7−r)6×5

⇒ (5−r)1=(7−r)(6−r)(5−r)6

⇒ 1=(7−r)(6−r)6 

⇒ (7−r)(6−r)=3×2 

⇒7−r=3⇒r=4