Math Puzzles: Classic riddles in counting, geometry, probability, and game theory

Без указания места издания и издательства, 2013. - 257p. 
You want to cut a tortilla into 8 pieces. What's the minimum number of cuts you need to make? Is it statistically harder to guess an iPhone password that uses 3-digits or one that uses 4 unique digits?
Two friends agree to meet up in a bar between midnight and 1 am. Each arrives at a random time and will wait 10 minutes for the other to show before leaving. What is the probability the two will meet at the bar? What if they are playing strategically?
Thousands of people read puzzles like these every Monday on the game theory blog Mind Your Decisions. This ebook is a compilation of 70 of the blog's best puzzles, divided into 25 classic puzzles in counting and geometry, 25 probability puzzles, and 20 game theory puzzles.
The puzzles are geared for someone that loves math, as some of the harder puzzles require calculus.