Combination Calculator
What is 10 choose 3?
10 choose 3 without repeats is 120.
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Exact answers to common counting and probability questions
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Permutation Calculator
What is 8P4?
8 permute 4 without repeats is 1,680.
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What is 6!?
6! is 720.
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What is 10C3?
The binomial coefficient C(10, 3) is 120.
Open answer pageFour Dial Lock Combination Calculator
How many combinations does a 4 letter lock have?
A 4-position lock code with 26 options per position has 456,976 possible codes.
Open answer pageProbability Calculator
What is the probability of drawing a queen from a standard deck?
The probability is 1/13, which is 0.076923 or 7.6923%.
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How many 4 digit PINs are possible?
10 choices for 4 ordered positions gives 10,000.
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What is the probability of drawing a red card from a standard deck?
The probability is 1/2, which is 0.5 or 50%.
Open answer pageHypergeometric Probability Calculator
What is the probability of at least 2 aces in a 5 card hand?
The probability of at least 2 successes is 4.1684%.
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What is 6 choose 3?
6 choose 3 without repeats is 20.
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What is 13!?
13! is 6,227,020,800.
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How many 5 digit PINs are possible?
10 choices for 5 ordered positions gives 100,000.
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What is the probability of drawing a king from a standard deck?
The probability is 1/13, which is 0.076923 or 7.6923%.
Open answer pageBinomial Probability Calculator
What is the probability of at least 2 heads in 5 coin flips?
The probability of at least 2 successes is 81.25%.
Open answer pageHypergeometric Probability Calculator
What is the probability of drawing exactly 3 aces in a 5 card hand?
The probability of exactly 3 successes is 0.1736%.
Open answer pageBinomial Coefficient Calculator
What is 21C6?
The binomial coefficient C(21, 6) is 54,264.
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How many 7 scoop combinations can you make from 3 flavours if repeats are allowed?
3 choose 7 with repeats allowed is 36.
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What is 12!?
12! is 479,001,600.
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