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  • 08-08-2017
  • Mathematics
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What is the sum of the arithmetic series? ∑[i=1,15,Fn=5i-1]

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jdoe0001 jdoe0001
  • 08-08-2017
[tex]\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[/tex]
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