A bag contains 5 red, 3 blue and 2 green counters. One counter is taken at random. What is the probability that it is not blue?
Answer and explanation
Correct answer: A. 7/10
- Step 1: There are 5 + 3 + 2 = 10 counters.
- Step 2: Not blue means 5 + 2 = 7 counters, so the probability is 7/10.
Answer
7/10.
Why not the others: 3/10 is the probability of blue, 1/2 is the probability of red and 1/5 is the probability of green.
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