How do you evaluate 5P4?
1 Answer
Jan 17, 2018
Explanation:
"using the definition for "^nP_rusing the definition for nPr
•color(white)(x)^nP_r=(n!)/((n-r)!)∙xnPr=n!(n−r)!
"where "n! =n(n-1)(n-2)...... xx3xx2xx1
rArr^5P_4=(5!)/((5-4)!)=(5!)/(1!)
[1! =1]
rArr^5P_4=5! =5xx4xx3xx2xx1=120
