Jumlah bilangan kelipatan 3 antara 100 dan 200
a. 2.475
b. 3.042
c. 3.850
d. 4.950
a. 2.475
b. 3.042
c. 3.850
d. 4.950
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b = 3
un = 198
maka :
Un = a + (n-1)b
198 = 102 + (n-1)3
96 = (n-1)3
96/3 = n-1
32 = n-1
33 = n
Sn = n/2 (2a + (n-1)b)
Sn = 33/2 (2x102 + (33-1)3)
Sn = 33/2 (204 + 32x3)
Sn = 33/2 (204 + 96)
Sn = 33/2 x 300
Sn = 4950 (D)