
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
We write the integers from 1 to 100 on a board, and at each step, Petit Nicolas erases two numbers, adds them, and writes the sum of the digits of the result.

1. In the end, the last number displayed is 24. Should Nicolas review his mental calculation?
2. Having redone his calculations without error, he obtains a number between 15 and 25. What is his result?

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