Question

A bag contains 3 blue coins and 9 red coins. A coin is removed at random and replaced by three of the other color. Part 1 out of 3 What is the probability that the removed coin is blue? Enter your answer as a simplified fraction. The probability that the removed coin is blue is

Answer 1

1/4

Explanation:

Taking one coin out and replacing it with 3 other coins is the same as saying "What is the probability of picking one blue coin out of the 12 coins." Due to this, the answer should be 25%.