
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
Choose one of the following three conditions:①$a_{2}=60$, ②the sum of binomial coefficients is $64$, ③the maximum term of the binomial coefficients is the $4$th term. Fill in the blank below. Given ${(1-2x)}^{n}={a}_{0}+{a}_{1}x+{a}_{2}{x}^{2}+…+{a}_{n}{x}^{n}(n∈{N}_{+})$,_____, find:<br/>$(1)$ the value of $n$;<br/>$(2)$ the value of $-\frac{{a}_{1}}{2}+\frac{{a}_{2}}{{2}^{2}}-\frac{{a}_{3}}{{2}^{3}}+…+(-1)^{n}\frac{{a}_{n}}{{2}^{n}}$.

Present the answer in LaTex format: \boxed{Your answer}
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