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Play around with this program a little bit. The Find the Ace game is a
demonstration of a principle of conditional probability; although it is counter-
intuitive, changing your pick will increase your chances of finding the ace
from 33 percent to 50 percent. Many people have difficulty understanding
this truth—that’s why it’s counterintuitive. The secret of hacking is under-
standing little-known truths like this and using them to produce seemingly
magical results.