The different arrangements of Numbers or objects in a particular order or form at a time are called permutations. In a collection, for ‘n’ number of objects the arrangement of ‘r’ objects (where r ?n) in a particular order is known as ‘r-permutation’.
The notation for ‘n’ number of objects the arrangement of ‘r’ objects (where r ?n) in a particular order will be nPr.
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