Mathematics, 30.07.2019 07:30, Pfaith8617
What is ∑n=18(3n−1) equal to? the top number is 8 bottom is n=1
Answers: 1
![\bf \sum\limits_{n=1}^{8}~3n-1\implies \sum\limits_{n=1}^{8}~3n-\sum\limits_{n=1}^{8}~1\implies 3\sum\limits_{n=1}^{8}~n-\sum\limits_{n=1}^{8}~1 \\\\\\ 3\left[ \cfrac{8(8+1)}{2} \right]~~-~~(8\cdot 1)\implies 3(36)~~-~~8\implies 108~-~8\implies 100](/tpl/images/0149/7306/3706c.png)
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What is ∑n=18(3n−1) equal to? the top number is 8 bottom is n=1...
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