How do you evaluate 10P8 using a calculator?
1 Answer
Jul 15, 2017
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#
