Mathematics, 31.08.2019 04:30 ramireznoem1031
What is the sum of the arithmetic series? β[i=1,15,fn=5i-1]
Answers: 3
![\bf \sum\limits_{i=1}^{15}\ 5i-1\implies 5\sum\limits_{i=1}^{15}\ i-\sum\limits_{i=1}^{15}\ 1\implies 5\left[ \cfrac{15(15+1)}{2} \right]-(15\cdot 1) \\\\\\ 5\cdot (15\cdot 8)-15\implies 585](/tpl/images/0213/9898/5b15a.png)
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What is the sum of the arithmetic series? β[i=1,15,fn=5i-1]...
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