Most computers (perhaps all computers) don't generate truly random values. To be truly random, the value must not be predictable. However, computers use complex mathematical formulas to generate values which look random, but really aren't. Even though the formulas are complex, they're still predictable.

Conceptually, random numbers generated by a computer can be thought of as a very, very long list of values. The computer always returns the values in the same order, but it doesn't always start at the same place in the list. If the list contained a million values, sometimes the computer would return values starting at the first value, but sometimes it might start at the 105,768th value. Because the starting point is unknown and the list is so long, a repeatable pattern is not discernable.

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