Question 21
Charles has 5 jars of paint: yellow, blue, red, pink and green. He can make a new colour by mixing any two of these colours. He cannot mix more than 2 colours together. What is the greatest number of different colours he can have, including the original colours?
Source scoring note: this optional Star of hope question awards 10 points for a correct answer and deducts 10 for a wrong answer; leaving it blank has no penalty in Preliminary. This practice import awards the 10 correct-answer points but does not apply the special wrong-answer deduction.
Source scoring note: this optional Star of hope question awards 10 points for a correct answer and deducts 10 for a wrong answer; leaving it blank has no penalty in Preliminary. This practice import awards the 10 correct-answer points but does not apply the special wrong-answer deduction.