
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 difference between the sums of two arithmetic sequences: $(2001 + 2002 + \cdots + 2100)$ and $(101 + 102 + \cdots + 200)$.
A) $190000$
B) $195000$
C) $200000$
D) $205000$

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