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How do you evaluate #9P4#?

1 Answer

Dec 16, 2016

# " "^9P_4" "=3024#

Explanation:

# " "^nP_r" "#has the formula

# " "^nP_r" "=(n!)/((n-r)!)#

so# " "^9P_4" "=(9!)/((9-4)!)#

so# " "^9P_4" "=(9!)/(5!)=(9xx8xx7xx6xxcancel(5!))/cancel((5!)#

# " "^9P_4" "=(9!)/(5!)=9xx8xx7xx6=3024#

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