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a=4
sn=40
cara nyari a sama b nya di eliminasi, rumus sn nya n/2 dikali a=(n-1).b
U8= a+7b = 23
nanti dieliminasi dan hasilnya
5b=15 => b=3
a+2(3)=8 => a=2
Sn= n/2 (2a+(n-1)b)
S5= 5/2 ( 2(2) + 4(3))
=5/2(16)
=40