
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 an arithmetic sequence $\{a_n\}$ with a positive common difference $d$, satisfying $a_3a_6=55$ and $a_2 + a_7=16$, there is a sequence $\{b_n\}$ such that $b_n = \frac {1}{a_na_{n+1}}$. The sum of the first $n$ terms of sequence $\{b_n\}$ is $T_n$.  
(1) Find the general term formula for sequence $\{a_n\}$.  
(2) Find $T_n$ and the range of $T_n$.

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