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Key Formulas
Arithmetic Mean
![]() Permutation
nPr =
, where r is the
size of the subgroup taken from a set with n elements.Combination
= , or nPr ⁄
r!, where r is the
size of the subgroup taken from a set with n elements.Probability
![]() Total Elements of Overlapping Sets
If two subsets of a set share elements, the equation that
governs the total number of elements in the set is:
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