Lesson: Chapter - 11

Key Formulas

Arithmetic Mean

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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