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How do you evaluate 20P2?

1 Answer

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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