Mathematics, 31.01.2020 06:01 santiago172005
Find s20 for the arithmetic series 8 + 16 + 24 + 32 +… super confused cause my options for answers are 1)1672 2)1688 3)1664 4)1680 shouldnt the answer be 160?
Answers: 2
.![S_{n} =\frac{n}{2}[2 a+(n-1)d]](/tpl/images/0488/7248/79b81.png)
.![S_{20} =\frac{20}{2}[2*8+(20-1) 8]](/tpl/images/0488/7248/080f8.png)
.![S_{20} =10[16+(19) 8]](/tpl/images/0488/7248/e751a.png)
.![S_{20} =10[16+152]](/tpl/images/0488/7248/5f7f5.png)
.![S_{20} =10[168]](/tpl/images/0488/7248/21077.png)
.
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Find s20 for the arithmetic series 8 + 16 + 24 + 32 +… super confused cause my options for answers a...
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