
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
Observe the table below:  
1,  
2,3  
4,5,6,7  
8,9,10,11,12,13,14,15,  
...  
Question: (1) What is the last number of the $n$th row in this table?  
(2) What is the sum of all numbers in the $n$th row?  
(3) Which row and position is the number 2008?

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