Multiple choice

There are $20$ marbles in a bag and $10$ of them are blue. What is the probability that any $1$ marble drawn at random will not be blue?

  1. $\dfrac{2}{5}$
  2. $\dfrac{10}{9}$
  3. $\dfrac{1}{20}$
  4. $\dfrac{1}{2}$
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D Correct answer
Explanation

Total marbles = 20. Blue marbles = 10. Non-blue marbles = 20 - 10 = 10. The probability of not drawing a blue marble is 10/20 = 1/2.

AI explanation

The bag contains a total of 20 marbles, and 10 of them are blue, which means 10 marbles are not blue. The probability of drawing a non-blue marble is the number of non-blue marbles divided by the total number of marbles. This gives a probability of 10 divided by 20, which equals 1/2.

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