SOLUTION: If P(n,2)=20 then what is the value of n? Show your solution

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Question 1106617: If P(n,2)=20 then what is the value of n? Show your solution
Answer by Alan3354(69443) About Me  (Show Source):
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If P(n,2)=20 then what is the value of n? Show your solution
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(n+1)*n = 20
--> 5*4 = 20