Answer:
S
ThenSn=n(a1+an)2Sn=n(a1 + an)2 , where nn is the number of terms, a1a1 is the first term and anan is the last term. The sum of the first nn terms of an arithmetic sequence is called an arithmetic series .
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Answer:
There is no change.
Step-by-step explanation:
With what there’s nothing
, my friend I think you forgot to post the picture
Answer:
All Real Numbers
Step-by-step explanation: