difference between permutations and combinations

Permutations are arrangment of r things out of n, sequentially.

If we take three letters a, b, c, the various arragements of them are abc, acb, bca, bac, cab, cba.

Hence we have 6 permutations.

But in combinations the order doesn't matter as long as it's the same thing.

For example, abc,  acb, bca, bac, cab, cba are all the same. And we have only one combination while 6 different permutation.

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TopperLearning.