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

User Orgil
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5 votes
810
.....+27+31+35+39+43+47+51+55+59+63+67+71+75+79
User Mjaskowski
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