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4 + (n-1).5
4+5n
n = 20
sn = 1/2.n +(2.a (n-1).b
= 10 + 8 .19.5
= 10 + 760
= 770
selebihnya ikutin rumus ajj pasti ketemu
Rumus Sn=n/2(a+Un)
a). a=4, b=5, Un=104
n=(104-4+5)/5=105/5=21
S21=21/2(4+104)=10,5(108)=1134
b). a=72, b=-6, Un=12
n=(12-72-6)/-6=-66/-6=11
S11=11/2(72+12)=5,5(84)=462
c). a=-12, b=4, Un=128
n=(128-(-12)+4)/4=144/4=36
S36=36/2(-12+128)=18(116)=2088
satu lg coba sendiri ya