SOLUTION: What is the sum of:
S sub 21 for 23+20+17+14+...
Thank you in advance!
Algebra.Com
Question 474057: What is the sum of:
S sub 21 for 23+20+17+14+...
Thank you in advance!
Answer by Tatiana_Stebko(1539) (Show Source): You can put this solution on YOUR website!
23, 20, 17, 14, ... an arithmetic progression
Formula , so
, then
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