Tentukan jumlah 12 suku pertama deret aritmatika jika U1=10 dan Un=-128.... Question from @rioswibowo

October 2018 2 7 Report

Tentukan jumlah 12 suku pertama deret aritmatika jika U1=10 dan Un=-128

verin3 $S12 = \frac{1}{2}n(a+Un) \\ S12 = \frac{1}{2} 12(10+(-128)) \\ S12 = -708$

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irna123 Sn = 1/2 n (u1+un)
s12 =1/2 12 (10+ -128)
s12 = 6 (-118)
s12 = -708

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