
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
Given the same pattern of sets of consecutive integers $\{1\}$, $\{2,3\}$, $\{4,5,6\}$, etc., where each set begins after the last element of the previous set and includes one additional element, calculate the sum of the elements in the 15th and 16th set combined.
A) 2951
B) 3751
C) 4251
D) 4951

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