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Jumlah bilangan kelipatan 2 antara 100-200 adalah 49Bab Barisan dan Deret Bilangan
102, 104, 106, ..., 198
b = U2 - U1
b = 104 - 102
b = 2
Un = 198
a + (n - 1) . b = 198
102 + (n - 1) . 2 = 198
(n - 1) . 2 = 198 - 102
n - 1 = 96/2
n = 48 + 1
n = 49
Sn = n/2 . (a + Un)
S49 = 49/2 . (102 + 198)
S49 = 49/2 . 300
S49 = 7.350