A bag contains 5 red balls, 3 blue balls and 2 green balls. If a ball is drawn at random from the bag, what is the probability that it is NOT red?
A1/2CORRECT
B3/10
C1/5
D2/5
GCEFurther MathematicsProbability and Statistics2023
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Why the answer is A, and why the others tempt you.
Total balls = 5 + 3 + 2 = 10. Balls that are not red = 3 + 2 = 5. P(not red) = 5/10 = 1/2. The distractors represent P(blue) = 3/10, P(green) = 2/10 = 1/5, and P(green) = 2/5 which is incorrect.
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