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What is the sum of the first 19 terms of the arithmetic series?

3+8+13+18+…

 Mar 6, 2018
 #1
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Did my answer ever send?

-Hayley

 Mar 6, 2018
 #2
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Correct me if I am wrong, lol. But is it

3,8,13,18,23,28,33,38,43,48,53,58,63?

-Hayley

 Mar 6, 2018
 #3
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It wasn't correct, but I had already put my answer in and it was right. Thank you so much for the effort though. 

adore.nuk  Mar 6, 2018
 #4
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Im sorry! I am curious though, what was the answer??

-Hayley

Guest Mar 6, 2018
 #5
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Don't you know the formula for Arithmetic Series?

S = N/2 [2F + (N - 1)*D], where N=Mumber of terms, F=First term, D =Common difference

 

S = 19/2 [2*3 + (19 - 1)*5]

S = 9.5 [6 + (18*5) ]

S = 9.5 [6 +  90 ]

S = 9.5 x 96

S = 912

 Mar 6, 2018

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