How do you evaluate 6p4?

1 Answer
Jim G.
Mar 12, 2018

#360#

Explanation:

#"using the definition of "^nP_r#

#•color(white)(x)^nP_r=(n!)/((n-r)!)#

#"where "n! =n(n-1)(n-2)......xx3xx2xx1#

#rArr^6P_4=(6!)/((6-4)!)=(6!)/(2!)#

#(6!)/(2!)=(6xx5xx4xx3xx2xx1)/(2xx1)=720/2=360#

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