Hi, 

find the sum of each arithmetic series:  

Note:   and 

  +1+6+...+     || d= 5 

91 = -4 + (n-1)5 

n = 20 

 

13+20+27+...+272  ||d = 7

89+86+83+...+20   ||d = -3

8+11+14+...+23    ||d = 3 

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