Permutations and combination
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An arrangement that can be formed by taking some or all of finite set of things is called permutation.
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Permutation means knowing the number of ways of rearranging objects/things.
Example - Number of ways of rearranging 3 books in 3 places.
Combination means knowing the number of ways of selecting objects/things.
Example - Number of ways of selecting 2 boys from a group of 4 boys..
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