
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 arithmetic sequence $\\{a_{n}\\}$, where $a_{2}=3$, $a_{4}=7$, and $b_{n}=a_{2n}$,
(1) Find $b_{n}$;
(2) Find the sum of the first $n$ terms of the sequence $\\{ \frac {1}{a_{n}a_{n+1}}\\}$.

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