How do you evaluate 20P2?

1 Answer
Dwight
Mar 5, 2017

Steps and result are outlined below...

Explanation:

The general formula for a permutation is

""_nP_r = (n!)/(n-r!)

In this case, n=20 and r=2, so our equation becomes

""_20P_2 = (20!)/(18!) = (20xx19) = 380

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