# 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

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