P(20,2) = \frac{20!}{(20-2)!} = \frac{20!}{(18)!} = 380
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Step 1: Calculate (20 ~ 2)! (20 ~ 2)! = 20! / (20-2)! = 20! / 18! = 20 * 19 * 18! / 18! = 20 * 19 = 380 Show more…
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