Multiple choice

A bag contains $18$ balls out of which $x$ balls are red. If one ball is drawn at random from the bag, then what is the probability that it is not red if x is 6?

  1. $\dfrac{2}{3}$
  2. $\dfrac{3}{18}$
  3. $\dfrac{18}{6}$
  4. $1+\dfrac{6}{18}$
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A Correct answer
Explanation

Total balls = 18. Red balls = 6. Not red balls = 18 - 6 = 12. Probability = 12/18 = 2/3.

AI explanation

Substitute the value of x as 6 to find that there are 6 red balls in the bag. Subtracting this from the total number of balls means there are 18 minus 6, or 12 balls that are not red. Using the classical probability formula, the probability of drawing a non-red ball is 12 divided by 18, which simplifies to 2/3.

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