Probability Calculator

This calculator handles the three questions that cover most probability problems. Give favourable and total outcomes for a single event and it returns the probability, the complement and the odds in reduced form. Give two probabilities and it returns the chance that both happen, that either happens, that neither happens and that exactly one happens. Give one probability and a number of tries and it returns the chance of at least one success, of none at all and of a clean sweep. The two-event and repeated-trial results assume the events are independent, so they do not hold when one outcome changes the chance of another.