A dice roller simulates rolling one or more dice with any number of sides — standard d6, or polyhedral dice (d4, d8, d10, d12, d20, d100) used in tabletop RPGs. Results follow a uniform distribution (equally likely outcomes) for a single die.
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Pro Tip
For probability: P(rolling at least N on a d20) = (20 − N + 1) / 20. Rolling a 15 or higher: (20−15+1)/20 = 6/20 = 30% chance.
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Did You Know?
The d20 is one of the oldest gaming implements — icosahedral (20-sided) dice carved from serpentine stone have been found in Egypt dating to 304–30 BCE. Dungeons & Dragons popularized the d20 system in 1974.
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