
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 of the following sequence:
\[ 2\left(1-\dfrac{1}{2}+\dfrac{1}{3}\right) + 3\left(1-\dfrac{1}{3}+\dfrac{1}{4}\right) + \cdots + 15\left(1-\dfrac{1}{15}+\dfrac{1}{16}\right) = \]
A) 100  
B) 105  
C) 110  
D) 115  
E) 120

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