Multiple choice

A bag contains 6 red balls, 11 yellow balls and 5 pink balls. If two balls are drawn at a random from the bag, one after another, what is the probability that the first ball drawn was red and the second ball drawn was yellow in colour?

  1. 3 14

  2. 5 7

  3. 1 7

  4. 1 14

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

Total balls = 6+11+5 = 22. P(Red first) = 6/22 = 3/11. P(Yellow second | Red first) = 11/21. Total probability = (3/11) * (11/21) = 3/21 = 1/7.