
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
A phone company decided to streamline the procedure for issuing phone numbers in a new residential area as follows: residents of apartments with even numbers are to be given seven-digit numbers consisting only of even digits, and residents of apartments with odd numbers are to be given seven-digit numbers consisting only of odd digits. How many possible seven-digit numbers can be formed: a) only with even digits, not starting with 0, b) only with odd digits, c) which type of numbers will be more and by how many times?

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