what is combinations? in mathematical terms
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In mathematics, a combination is a selection of items from a collection, such that the order of selection does not matter.
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A combination is a mathematical technique that determines the number of possible arrangements in a collection of items where the order of the selection does not matter.Combinations can be confused with permutations. However, in permutations, the order of the selected items is essential.
Formula
n Cr=n ! divided by r ! (n-r)!
n Cr = number of combinations
n = total number of objects in the set
r = number of choosing objects from
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