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what is the difference b/w permutation & combination
A permutation is an arrangement of objects in some specific order. Permutations are regarded as ordered elements. 

A selection in which order is not important is called a combination. Combinations are regarded as sets. 

For example, if there is a group of 3 different colored balls, then any group of 2 balls selected from it will be considered as a combination, whereas the different arrangements of every combination will be considered as a permutation.


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