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Let's Learn about Probability! |
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An arrangement (or ordering) of a set of objects is called a permutation.
(We can also arrange just part of the set of objects.)
In a permutation, the order that we arrange the objects in is important Consider arranging 3 letters: A, B, C. How many ways can this be done? The possible permutations are
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A combination of n objects taken r at
a time is a selection which does not take into account the arrangement
of the objects. That is, the order is not important
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