1. Can 4 natural numbers be written on 4 cards such that when each is increased by 1, their product increases by 3 times
Answer: It is possible.

Solution. The numbers were 2, 3, 4, 5. They became 3, 4, 5, 6.

The product increased by 3 times.

## Grading Criteria.

Correct answer without justification: 0 points. Correct example: 7 points.