In the expansion of ${{\left( 1+3x \right)}^{n}}$, where $n$ is a positive integer, in the ascen

Question

In the expansion of ${{\left( 1+3x \right)}^{n}}$, where $n$ is a positive integer, in the ascending powers of $x$, the coefficient of the third term is $135$ . Find the value of $n$.

Accepted Answer

$n=6$

Binomial Theorem - Finding Parameters in Binomial Expansions

Binomial Theorem - Finding Parameters in Binomial Expansions

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