Asked by mary ann

Permutation
Evaluate the expression
19 P 2

4 P r if there is no r would the answer be
just 4 or 0
Answered by Reiny
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
Answered by Mary Ann
thank you
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