SOLUTION: What is the sum of the first 10 terms of the arithmetic series {1, 4, 7, 10 ...}

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Question 944507: What is the sum of the first 10 terms of the arithmetic series {1, 4, 7, 10 ...}
Answer by Fombitz(32388) About Me  (Show Source):
You can put this solution on YOUR website!
The common difference is 3.
So,
1=x%2B3%281-1%29
x=1
and the series is,
a%5Bn%5D=1%2B3%28n-1%29
a%5Bn%5D=1%2B3n-3
a%5Bn%5D=3n-2
and