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probabilityClassic tool

Probability and Attempts Calculator

Estimate the chance of success after multiple attempts from a per-attempt probability.

Enter the chance of success for a single attempt and the number of repetitions to find the probability of succeeding at least once. The tool is useful for basic probability studies, tests, games, raffles, experiments and quick simulations.

It also shows the probability of failing every attempt and the expected number of successes across the set.

At least one success-

All attempts fail-

Expected successes-

Use clear inputs to get a more useful result.