Question 20
Andy has a number of red, green and blue counters.
He places eight counters equally spaced around a circle according to the following rules:
- No two red counters will be next to each other.
- No two green counters will be diagonally opposite each other.
- As few blue counters as possible will be used.
How many blue counters will Andy need to use?
He places eight counters equally spaced around a circle according to the following rules:
- No two red counters will be next to each other.
- No two green counters will be diagonally opposite each other.
- As few blue counters as possible will be used.
How many blue counters will Andy need to use?