SOLUTION: find the sum of the terms of the arithmetic sequence1,7,13,19,...109 n = 19

Question 724411: find the sum of the terms of the arithmetic sequence1,7,13,19,...109 n = 19
Found 2 solutions by mananth, stanbon:
Answer by mananth(16946) (Show Source): You can put this solution on YOUR website!
First term = 1
difference = 6
n=19
Sn= 2a+(n-1)d
S19=2+18*6
=2+108
=110
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
find the sum of the terms of the
arithmetic sequence1,7,13,19,...109; n = 19
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S(19) = (19/2)(1+109) = (19)(55) = 1045
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Cheers,
Stan H.
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