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105+110+115+...+995
a=105, b=5, Un=995
n=(Un-a+b)/b=(995-105+5)/5=895/5=179
Sn=n/2(a+Un)=179/2(105+995)=89,5(1100)=98.450
habis dibagi 5 dan 6
120+150+180+...+990
a=120, b=30, Un=990
n=(990-120+30)/30=900/30=30
Sn=30/2(120+990)=15(1110)=16.650
Bil yg habis dibagi 5 tetapi tidak hbs dibagi 6 :
Banyak bilangan = 179-30=149
Jumlah Bilangan =98.450-16.650=81.800