
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 a sequence $\{b_n\}$ by:
$b_1 = 5$
$b_{n+1} = b_n + 3n + 1$
Calculate $b_{50}$.
A) 3700
B) 3729
C) 3750
D) 3775

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