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.

  1. Step 1: Total counters: .
  2. Step 2: Counters that are not blue: .
  3. 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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A bag contains 3 red… | GCSE English and Maths Resits (Grade 4)