7.4. In a $4 \times 4$ square (cells), crosses were placed in eight cells. Is it necessarily true that in some row or some column there will be exactly two crosses?
Answer: not necessarily. Solution. See example.

![](https://cdn.mathpix.com/cropped/2024_05_06_b77857bcd93115cc3d5fg-1.jpg?height=166&width=231&top_left_y=1730&top_left_x=1712)