
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
Define \( T_n = 1 + 2 - 3 + 4 - 5 + \cdots + (-1)^{n}n \) for \( n = 1, 2, \ldots \). Compute the value of \( T_{18} + T_{34} + T_{51} \).
A) 140
B) 154
C) 162
D) 169
E) 175

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