MATH FORMULAS
Permutations:
Note: Multiple events means multiply! This rule applies to ALL permutation, combination and probability questions in some way.
No math formula required. Draw a picture, keep track of the results and multiply
Combinations:
Combination Formula
n = Number of items
k = Number of items to be selected
Example:
Probability:
Probability =
“and” = Multiply
“or” = Add
Example:
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