While some casino games have a skill element in the outcome, some casino games are purely based upon chance. Because all trusted online casino casino games are partly or completely driven by chance, all casino games rely on a random number generator, or RNG in the software that powers the game. The RNG is a mathematical application that does precisely what it says: generates a completely random number. Not all RNGs are identical, and they have to be tested extensively to ensure that the numbers they generate actually are random.

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