Sample Question #309 (probability theory)
Another fun brainteaser-type question involving odds.
The odds of winning the Powerball lottery in the U.S. on one ticket is 1 in 195,249,054. ($1 buys one ticket.) How many $1 tickets do you have to play in order to have a probability of more than 1/2 to win the jackpot (grand prize) at least once in the games you have played? Does it make a difference if you buy one ticket per drawing, 10 tickets per drawing, or 1000 tickets per drawing? Also, does it make a difference if you play different numbers each time, or stick with the same numbers all the time?
[Disclaimer: this is absolutely not a promotion of any kind of lottery! This is just a sample interview question that tests your probability theory knowledge]