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liraira [26]
3 years ago
7

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

Mathematics
1 answer:
Helen [10]3 years ago
8 0
\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
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