SOLUTION: use partial sum formulas and the information provided to find the sum : 1 - 4 + 16 - 64 .... n = 9 20 + 27 + 34 + 41 .... n = 16

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 Question 616826: use partial sum formulas and the information provided to find the sum : 1 - 4 + 16 - 64 .... n = 9 20 + 27 + 34 + 41 .... n = 16Answer by ewatrrr(10682)   (Show Source): You can put this solution on YOUR website! ``` Hi, use partial sum formulas and the information provided to find the sum : 1 - 4 + 16 - 64 .... n = 9 Geometric = 1 and r = -4 20 + 27 + 34 + 41 .... n = 16 Arithmetic = 20 and d = 7 ```