The term permutation refers to several ways of arranging a set of objects in a sequential order.The differences between permutation and combination are drawn clearly on the following grounds: Key Differences Between Permutation and Combination Total number of possible combinations of n things, taken r at a time can be calculated as: When two out of three letters are to be selected, then the possible combinations are mn, no, om.When three out of three letters are to be selected, then the only combination is mno. The combination is defined as the different ways, of selecting a group, by taking some or all the members of a set, without the following order.įor example, All possible combinations chosen with letter m, n, o – Total number of possible permutations of n things, taken r at a time, can be calculated as:
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