
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
Assume that every 7-digit whole number is a possible telephone number except those that begin with 0 or 1. What fraction of telephone numbers begin with an even digit (2, 4, 6, 8) and end with an odd digit (1, 3, 5, 7, 9)?
A) $\frac{1}{4}$
B) $\frac{1}{3}$
C) $\frac{1}{2}$
D) $\frac{3}{4}$
E) $\frac{1}{5}$

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