
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
The student union of a school consists of 5 freshmen, 6 sophomores, and 4 juniors.  
(1) How many different ways are there to select one person as the president of the student union?  
(2) If one person from each grade is selected as a standing committee member of the student union, how many different ways are there to do this?  
(3) If two people from different grades are selected to participate in an activity organized by the city, how many different ways are there to do this?

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