A bag has 5 red, 7 blue and 6 green balls. One ball is drawn at random. What is the probability that it is red?
Answer and explanation
Correct answer: B. 5/18
- Step 1: There are 18 balls in total and 5 are red, so the probability is . Answer: 5/18. Why not the others: 7/18: uses the wrong colour. 5/12: ignores the green ones. 3.6: inverts the fraction.
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