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Nb:pokoknya angka kelipatan 6
18,24,30,36,42,48,54,60,66,72,78,84,90,96,112
Un=6n-(6-(-5)
Un=6n-11
115=6n-11
6n=115+11
6n=126
n=126/6=21
maka jumlahnya
Sn=n/2(a+Un)
S21=21/2(-5+115)
S21=10,5 (110)
S21=1155