Find the value of the second largest term in the expansion of `(4+5x)^(20)` when `x = 1//3`

Explanation

To find the second largest term in the expansion of \((4 + 5x)^{20}\) when \(x = \frac{1}{3}\), we can follow these steps:

### Step 1: Identify the general term in the binomial expansion
The general term \(T_r\) in the expansion of \((a + b)^n\) is given by:
\[ T_r = \binom{n}{r} a^{n-r} b^r \]
For our case, \(a = 4\), \(b = 5x\), and \(n = 20\). Thus, the general term becomes:
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