You are walking on the street and notice a guy gambling with some other guys and you start to watch.
The game principle is pretty easy. There is a standard 52-card deck and it is being shuffled every time before the game begins. You take five random cards and if at least two of them has the same rank (2,3..., J,Q,K,A) you win, otherwise you lose.
In the long run, you should play or not? (with probabilities of course)