# Probability

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 Calculators Combination Calculator   Calculates how many ways you can choose "r" objects from a set of "n" objects. Tutorials About Occupancy Probability Occupancy Probability Problems are also known as Bernoulli Trials Part 1  Solving Occupancy Probability Problems by the "Brute Force" Method: Part 1 Part 2  Solving Occupancy Probability Problems by the "Brute Force" Method: Part 2 Part 3  Solving Occupancy Probability Problems Mathematically 4 Sided Die  Probability of all 4 numbers in 7 Rolls 6 sided die  Probability of all 6 numbers in 13 Rolls 8 Sided Die  Probability of all 8 numbers in 20 Rolls 12 Sided Die  Probability of all 12 numbers in 35 Rolls 20 Sided Die  Probability of all 20 numbers in 67 Rolls 38 Number Roulette Wheel  Probability of spinning all 38 numbers in 152 spins Rolling a six-sided die  Probability of rolling at least 2 sixes in four throws. Rolling a six-sided die  Probability of rolling at least 2 sixes in four throws.(Solved by using binomial distribution formula). Calculating Birthday Probability Birthday Paradox  How many people do you have to select to have a 50% chance that two have the same birthday? Multiple Birthdays  How many people are required to have a 50% chance that three or more have the same birthday?