nth term from the end of the expansion of\(\rm (2x - \frac {x} {2})^n\)

1
\(\rm - nx^n​​​.2^{(n - 1)}\)
2
\(\rm nx^n​​​.2^{(n - 1)}\)
3
\(\rm - nx^n​​​.2^{(n - 2)}\)
4
\(\rm nx^n​​​.2^{(n - 2)}\)

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