A bag contains red, blue and green counters. One is taken at random. What is the probability it is not blue?
Answer and explanation
Correct answer: A.
- Step 1: Total counters: .
- Step 2: Counters that are not blue: .
- Step 3: Probability .
Answer
.
Why not the others: : This is the probability of red, not of 'not blue'. : This is the probability of green. : This divides the red counters by the red and green counters only.
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