Mathematics, 24.06.2020 02:01 chrisraptorofficial
Find the sum of the first 31 terms of the following series, to the nearest integer. 5 , 14 , 23 , . . .
Answers: 3
![S_{n}=\frac{n}{2}[2a+(n-1)d]\\\\S_{31}=\frac{31}{2}[2*5+30*9]\\\\=\frac{31}{2}[10+270]\\\\=\frac{31}{2}*280\\\\=31*140\\\\=4340](/tpl/images/0692/7315/fc0f5.png)
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Find the sum of the first 31 terms of the following series, to the nearest integer. 5 , 14 , 23 , ....
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