"Permutation and combination are methods for representing a collection of things by picking them from a set and dividing them into subsets. It specifies the numerous methods for organizing a set of data. Permutations are used to pick data or objects from a group, whereas combinations are used to represent the order in which they are displayed. In mathematics, both concepts are crucial. Permutation is the act of putting all the members of a set into a sequence or order in mathematics. Permuting, in other words, is the process of rearranging the elements of a set that has previously been sorted. The combination is a method of choosing elements from a collection in such a way that (unlike permutations) the result is the same". Refer to this PPT for UPSC IAS/IPS Prelims Permutation, Combination & Probability (1995-2018) Paper I & II question paper.

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