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Each die roll uses a cryptographically secure pseudo-random number generator for fair results. For tabletop RPGs, enter notation like 2d6+3 (roll two six-sided dice and add 3). Probability distributions are uniform for a single die; multiple dice produce a bell curve. The expected value of a d6 is 3.5; 4d6 drop-lowest (D&D ability scores) averages about 12.2.