Answers: 2
![S_n=\frac{n}{2}[2a+(n-1)d]](/tpl/images/0151/7522/b603c.png)
![S_{18}=\frac{18}{2}[2(1)+(18-1)2]](/tpl/images/0151/7522/75582.png)
![S_{18}=9[2+(17)2]](/tpl/images/0151/7522/d58b8.png)
![S_{18}=9[2+34]](/tpl/images/0151/7522/a2b09.png)
![S_{18}=9[36]](/tpl/images/0151/7522/cdd98.png)
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