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What is the sum of the first 18 terms of the arithmetic series 11+15+19+23+...?

What is the sum of the first 18 terms of the arithmetic series 11+15+19+23+...?
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1 vote
What is the sum of the first 18 terms of the arithmetic series 11+15+19+23+...?

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User Orgil
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8.6k points

1 Answer

5 votes
810
.....+27+31+35+39+43+47+51+55+59+63+67+71+75+79
answered
User Mjaskowski
by
7.9k points
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