Q9 of 195 Page 16

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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