How to evaluate P(10,2)?

Stricker42o2

Stricker42o2

Answered question

2023-02-18

How to evaluate P(10,2)?

Answer & Explanation

Riley Cisneros

Riley Cisneros

Beginner2023-02-19Added 7 answers

P ( a , b ) (often written a P b or P b a
can be evaluated by the formula
XXX a ! ( a - b ) !
In this case
XXX P ( 10 , 2 ) = 10 ! 8 ! = 10 × 9 × 8 × 7 × ... × 1 8 × 7 × ... × 1 = 90
Looking at it another way:
The first element has 10 options, leaving 9 options for the second element;
implying 10 × 9 = 90 ways of making the choices.

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