SOLUTION: Why do you divide by two in the formula n/2(3n-1)

SOLUTION: Why do you divide by two in the formula n/2(3n-1)

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Question 982316: Why do you divide by two in the formula n/2(3n-1)

Answer by josgarithmetic(39630) (Show Source): You can put this solution on YOUR website!
The 2 is clearly part of the denominator.
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