Answer:

- 1. Circles have to be moved out of the row of four circles.
- 2. The single circle in the first row must move: it would involve moving too many circles to convert this into a row of four circles, leaving none that could be moved to convert the others.
- 3. Therefore, row three must remain the same.
- 4. This leaves row two containing two circles to be converted into a row of four circles.

To do this we must move the outside two circles on the row containing four up to the second row, making this into a row of four. Then the single circle on the first row must be moved down to form the point of the triangle below the row that now contains two circles.