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3+6+9+...+498
a=3, b=3, Un=498
n=(Un-a+b)/b=498/3=166
Sn=n/2(a+Un)=166/2(3+498)=83(501)=41583
bil yg hbs di bagi 3 dan 5
15+30+45+…+495
a=15, b=15, Un=495
n=495/15=33
Sn=33/2(15+495)=16,5(510)=8415
Jadi Bilangan yg habis di bagi 3 tetapi tidak habis dibagi 5
Banyak bilangannya = 166-33=133 bilangan
Jumlahnya =41583-8415=33168