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banyak bilangan antara 301-500
a = 302
b = 1
U terakhir = 499
Un = a +(n-1)b
Un = 302 + (n-1)1
Un = 302 + 1n - 1
Un = 301 + n
499 = 301 + n
n = 499-301
n = 198
S198 = 198/2 (301+499)
S198 = 99 (800) = 79200
banyak bilangan antara 301-500 yg kelipatan 4
a = 304
b = 4
U terakhir = 496
Un = a +(n-1)b
Un = 304 + (n-1)4
Un = 304 + 4n - 4
Un = 300 + 4n
496 = 300 + 4n
496-300 = 4n
196 = 4n
n = 196/4
n = 49
S49 = 49/2 (304+496)
S49 = 24,5 (800) = 19600
Jumlah yang tdk has dibagi 4
banyak suku = 198-49 = 149 suku
jumlahnya = 79200-19600 = 59600