Question

2p(n, 3) = p(n+1,3)​

Answer 1

$\huge{ANSWER :-}$

$\huge \frac{p(n - 1,3)}{p(n,4)} = \frac{1}{9}$

${p(n,4) = 9p(n - 1,3)}$

$\huge \frac{n!}{(n - 4)!} = \frac{9(m - 1)!}{(n - 4)!}$

(n-4)! and (n-4)! cancel

then, n! and (n-1)! cancel

remaining balance 9 so the answer is

ANSWER :-

n = 9