Multiple choice

A bag contains 5 red and 5 blue balls. Balls are drawn one by one without replacement until all red balls are drawn. What is the probability that the last ball drawn is blue?

  1. 3/4

  2. 5/9

  3. 2/9

  4. 1/9
Reveal answer Fill a bubble to check yourself
B Correct answer
AI explanation

Drawing without replacement until all red balls are drawn means the second to last ball drawn must be the final red ball. The last ball drawn must therefore be one of the 5 remaining blue balls. The probability of the last ball being blue is 5/9.

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