Step 1:
The general term of a binomial expansion $(a-b)^n$ is given by the formula:
$$T_{r} = ^nC_{r-1} a^{n-r+1} b^{r-1}$$
where $T_{r}$ is the r-th term, $^nC_{r-1}$ is the binomial coefficient, and $a^{n-r+1}$ and $b^{r-1}$ are the powers of $a$ and $b$
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