If P(n – 1, 3) : P(n, 4) = 1 : 9, find n.
Given: P(n – 1, 3) : P(n, 4) = 1 : 9
To find: value of n
We know,
So, according to question:
P(n – 1, 3) : P(n, 4) = 1 : 9
⇒ n = 9
∴ The value of n = 9