Pre-Calculus Summary Calculator 
n! is defined as n x (n - 1) x (n - 2) x ... x 2 x 1
5! = 120 shown herePermutations are the number of ways you can choose r items from a total of n items (uniqueness not required)
12P5 = 95,040 shown here
12C5 = 792 shown hereLogarithms are defined by the equation Log ab = e
Log 1000b = 3, we get b = 10 shown here
Log(ab) = Log(a) + Log(b)
Log(x/y) = Log(x) - Log(y)
n! is defined as n x (n - 1) x (n - 2) x ... x 2 x 15! = 120 shown herePermutations are the number of ways you can choose r items from a total of n items (uniqueness not required)
| nPr = | n! |
| (n - r)! |
12P5 = 95,040 shown here
Combinations are the number of ways you can choose r unique items from a total of n items
| nCr = | n! |
| r!(n - r)! |
12C5 = 792 shown hereLogarithms are defined by the equation Log ab = e
Log 1000b = 3, we get b = 10 shown here
Log(ab) = Log(a) + Log(b)
Log(x/y) = Log(x) - Log(y)
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