
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
Johnny has updated his marble collection and now has 10 different colored marbles, including a special red marble that is his favorite. In how many ways can he choose four different marbles from his bag such that his selection always includes the red marble?

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