How do you evaluate 10P8 using a calculator?

1 Answer
Jul 15, 2017

Answer:

#1814400#

Explanation:

#"using the definition for " ""^nP""_r#

#"that is " ""^nP""_r=(n!)/((n-r)!)#

#"where " n! =n(n-1)(n-2)(n-3)........xx1#

#rArr""^(10)P""_8=(10!)/((10-8)!)=(10!)/(2!)larr" cancel "2!#

#=10xx9xx8xx7xx6xx5xx4xx3#

#=1814400#