Answers: 2
![{ \boxed{ \bf{S_{n} = \frac{n}{2} [2a + (n - 1)d]}}}](/tpl/images/1407/3157/7ba5e.png)
![{ \sf{S_{8} = \frac{8}{2}[(2 \times 1) + (8 - 1) \times 2 ]}} \\ \\ { \sf{{S_{8}} = 4(2 + 14)}} \\ { \sf{S_{8}}} = 4 \times 16 \\ { \sf{S_{8}}} = 64](/tpl/images/1407/3157/82869.png)
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Evaluate S8 for the series 1+3+6+9+12...
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