In statistics, in order to find the number of possible arrangements of a set of objects, we use a concept called permutations. There are methods for calculating permutations, and it's important to understand the difference between a set with and without repetition. Other important concepts that can apply to situations like permutations are the fundamental counting principal and basic probability.
Sample Problems (4)
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7 runners in a race, how many different ways can they medal?
How many distinct ways are there to arrange the letters in mom?
An ATM pin consists of four numbers. How many pins if
b) repetition is not allowed
How many ways can 5 guys and 4 girls be arranged so that guys and girls must alternate?