Question 4
In art class, Tí and Sửu each receive the pictured sheet of ten circles numbered 1 to 10. They colour each circle green, red or yellow so that touching circles have different colours.
1. Tí has coloured the bottom row as shown. What colours should Tí use for circles 4, 5, 6, and for circles 3, 2, 1?
2. Starting from the original picture, Sửu colours 4 circles yellow, 3 red and 3 green. How many colours are needed for circles 1, 2, 3? For circles 4, 7, 8? For circles 5, 6, 9? How many of circles 1 to 9 are yellow? What colour is circle 10?
1. Tí has coloured the bottom row as shown. What colours should Tí use for circles 4, 5, 6, and for circles 3, 2, 1?
2. Starting from the original picture, Sửu colours 4 circles yellow, 3 red and 3 green. How many colours are needed for circles 1, 2, 3? For circles 4, 7, 8? For circles 5, 6, 9? How many of circles 1 to 9 are yellow? What colour is circle 10?