Jumlah bilangan kelipatan 3 antara 400 dan 500 adalah...
a. 14.600
b. 14.850
c. 15.250
d. 15.400
a. 14.600
b. 14.850
c. 15.250
d. 15.400
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b = 3
Un (terakhir) = 498
Un = a + (n-1)b
Un = 402 + (n-1)3
Un = 402 + 3n - 3
Un = 399 + 3n
498 = 399 + 3n
498-399 = 3n
99 = 3n
33 = n
maka
Sn = n/2 (a+Un)
S33 = 33/2 (402 + 498)
S33 = 16,5 (900) = 14.850 (B)