# Problem 9.1 (7 points)

Each participant of the Olympiad filled out two questionnaires and put them in any two of the 4 piles of sheets on the table. Initially, the piles contained 2, 3, 1, and 1 sheets. Can it end up with an equal number of sheets in each pile?
# Solution:

The initial number of sheets is 7, each time it changes by 2, and remains odd and will never be a multiple of 4.

| Criteria | Points |
| :--- | :---: |
| Complete solution | 7 |
| Answer without justification | 0 |

## Answer: cannot