
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
Calculate the sum $1i + 2i^2 + 3i^3 + 4i^4 + 5i^5 + 6i^6 + ... + 2500i^{2500}$.
A) -1251 + 1251i
B) -1252 + 1252i
C) -1253 + 1253i
D) -1254 + 1254i

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