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What is the sum of the arithmetic series? ∑[i=1,15,Fn=5i-1]

What is the sum of the arithmetic series? ∑[i=1,15,Fn=5i-1]
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What is the sum of the arithmetic series? ∑[i=1,15,Fn=5i-1]

User Reoxey
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\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
User Sebastian Hofmann
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