Mathematics, 03.08.2020 14:01 Lilyy1k
What is the sum of arithmetic series 19+25+31+37+… Where n=9 ?
Answers: 3
![S=\frac{n}{2} [2a+(n-1)d]\\=\frac{9}{2} [2*19+(9-1)(6)]\\=\frac{9}{2} [38+48]\\=\frac{9}{2} (86)\\=9*43\\=387](/tpl/images/0716/6780/0e561.png)
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What is the sum of arithmetic series 19+25+31+37+… Where n=9 ?...
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