Mathematics, 09.05.2021 04:50 tangia
Find Sn or the sum for the given arithmetic series a1=8,d=-9,n=17
Answers: 2
![\large \boxed{Sn = \frac{n}{2}[ 2a _1 + (n - 1)d ] }](/tpl/images/2342/2788/26361.png)
![Sn = \dfrac{17}{2} [ (2 \times 8 )+ (17 - 1) \times ( - 9) ]](/tpl/images/2342/2788/4b14a.png)
![Sn = \dfrac{17}{2} [16 + (16 \times - 9)]](/tpl/images/2342/2788/1a00c.png)
![Sn = \dfrac{17}{2} [16 + ( - 144)]](/tpl/images/2342/2788/6e5be.png)
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Find Sn or the sum for the given arithmetic series a1=8,d=-9,n=17...
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