Multiple choice

A box contains 6 blue and 5 pink balls. Two balls are picked randomly one after the other from the box, without replacement. What is the probability that both balls are pink?

  1. 2/11

  2. 1/11

  3. 5/11

  4. 6/11

  5. 2/10

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Probability of drawing a pink ball is 5/11. If the ball is not replaced, then the box will have one less pink ball, so the probability of drawing a pink ball in the next chance is 4/10. Hence, the probability of drawing 2 pink balls = 5/11 * 4/10 = 2/11. Hence, it is the correct answer.