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A '''random number generator''' picks numbers at chance from a distribution.
The most common type is a ''uniform generator'', where each number has an equal chance. If a uniform generator yields decimal digits from 0 to 9, then each digit has a 10% chance. The other type is a [[unbias a random generator|''weighted'' or ''biased'' generator]], where the chances are not equal. A biased generator that yields 0 with 70% chance, yields 1 with 30% chance, would probably yield more zeros than ones.
''True random numbers'' are impossible to predict. Many programs use ''pseudorandom numbers'', which are not as good. A pseudorandom generator uses a formula and a state to calculate a sequence of numbers. Anyone who knows the formula and the state can predict those numbers.
Pseudorandom numbers can also have statistical problems. True random numbers are [[wp:independence (probability theory)|independent]]. A pseudorandom sequence may contain patterns where the values of some numbers change the probabilities of other numbers.
See also [[Pick_random_element]].
== Tasks ==
- [[Random number generator (included)]]
- [[Random number generator (device)]]
- Everything in [[:Category:Randomness]]
== Links ==
- Wikipedia's article about [[wp:Random number generation|Random number generation]]
- [http://csrc.nist.gov/groups/ST/toolkit/rng/index.html NIST's statistical tests for random numbers]