Because you're in an exam, and you cannot really draw a straw. So you have to choose a number randomly, and pretend you chose the short straw if it's a 0. And t

Because you're in an exam, and you cannot really draw a straw. So you have to choose a number randomly, and pretend you chose the short straw if it's a 0. And then hope you're the only one. The article also discussed how it'll work if you prepare beforehand and actually can draw a straw. Spoiler: you might want to cheat if you chose the short straw :)