Multiple choice general knowledge math & puzzles

You have three bags, each containing two marbles. Bag A contains two white marbles, Bag B contains two black marbles, and Bag C contains one white marble and one black marble. You pick a random bag and take out one marble. It is a white marble. What is the probability that the remaining marble from the same bag is also white?

  1. 1/2

  2. 3/4

  3. 2/3

  4. 1/4
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

There are 3 white marbles that could have been picked (2 from Bag A, 1 from Bag C). In 2 of those 3 cases, the remaining marble is white (Bag A). Thus, the probability is 2/3.

Keep practicing — related questions