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#12 Help

NotSoSmart  Mar 16, 2018
 #1
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+2

12.

 

There are 15 terms

 

The sum is   

 

(-15 + 195) * (15/2)  =  1350

 

 

13.   The second answer is correct

 

 

 

cool cool cool

CPhill  Mar 16, 2018

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