If the sum of `n` terms of an A.P. is `3n^2+5n` and its mth term is 164, find the value of `mdot`

Explanation

To solve the problem step by step, we will follow the given information about the arithmetic progression (A.P.).

### Step 1: Understand the sum of n terms of an A.P.
The sum of the first n terms of an A.P. is given by:
\[ S_n = 3n^2 + 5n \]

### Step 2: Use the formula for the sum of n terms
The formula for the sum of the first n terms of an A.P. is:
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