# What is the mathematical probability of rolling 2 1s when rolling for d20s at the same time?

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- 4 weeks agoFavorite Answer
Is that rolling 4 d20s?

(1/20) * (1/20) * (19/20) * (19/20) =

361 / 16000 =

0.361 / 16 =

0.1805/8 =

0.09025/4 =

0.045125/2 =

0.0225625

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Yeah, that was a typo. Thanks for answering!