
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
During her birthday, Laura and her 3 younger brothers are to receive new cellphones from their parents. To ensure variety and due to promotional discounts, the parents decide to choose from among 15 service providers who offer family plans. Given that no two siblings can have the same provider, in how many ways can the parents select the providers for their four children?

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