Monday, September 30, 2019

Brain Teaser #102

What Is It?

1. There are four colored balls in a hat: two red, one black and one blue. After pulling out two of them, you know that one of them is red, but you do not know which one. What is the probability that both balls are red?

2. While walking across a bridge I saw a boat full of people. Yet on the boat there wasn't a single person. Why?

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