Permutation
nPr =
,
where r is the size of the subgroup taken from a set with n
elements.
Combination
(nr = 
, 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:
Total Elements = Group A Elements + Group B Elements + Neither Group A nor Group
B Elements – Group A and Group B Elements
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Mathematics Practice Questions
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