Algebra

Permutation
Evaluate the expression
19 P 2

4 P r if there is no r would the answer be
just 4 or 0

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  1. 19 P 2
    = 19!/(19-2)!
    = 19(18)(17!)/(17!
    = 19(18)
    = 342

    If by "if there is no r" you mean "if the value of r = 0"

    then
    4P0
    = 4!/(4-0)!
    = 1

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    posted by Reiny
  2. thank you

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