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Riddle:
A city has one million inhabitants which one hundred are terrorists. Facial recognition software has been installed on security cameras to sound an alarm when detecting a terrorist. There are two bugs: 1. False negative: When scanning a terrorist, the alarm will only sound 99 percent of the time. 2. False positive: When scanning a non-terrorist, the alarm will incorrectly be triggered 1 percent of the time. The alarm sounds. What is the approximate probability that the inhabitant is a terrorist? a) 99 percent b) 98 percent c) less than one percent
Answer: C. Even though the bugs rarely apply, there are way more civilians than terrorists and less than one percent of the city are terrorists.
Riddle:
Two fathers and two sons go fishing. Every person catches a fish and comes back with it. They come back with three fish. How is this possible?
Answer: One is a son, one is a father to the son and a son to his son's grandfather. The grand father is a father. 2 fathers ( grandfather and father)+2 sons (grand son and father)= 3 people. Try put this math trick on your teacher!
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