In more detail
For independent events, P(A and B) = P(A) × P(B). The chance of at least one 6 in four rolls is 1 − (5/6)⁴ = 0.5177: it is often easiest to calculate "none" and subtract from 1. See How Randomness and Fair Draws Work.
Glossary
Math & Statistics
Probability
Probability is a number from 0 (impossible) to 1 (certain) that measures how likely an event is.
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See also
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Glossary
Binomial distribution
The binomial distribution gives the probability of a number of successes in a fixed number of independent yes/no trials with the same.
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Glossary
Combination
A combination is a selection of items where order does not matter; `C(n, k) = n! / (k! (n − k)!)` counts the ways to choose k from n.