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Kelas 8 MatematikaBab Barisan dan Deret Bilangan
27, 30, 33, ..., 123
Un = 123
a + (n - 1) b = 123
27 + (n - 1) . 3 = 123
(n - 1) . 3 = 123 - 27
n - 1 = 96 : 3
n = 32 + 1
n = 33
Sn = n/2 . (a + Un)
S33 = 33/2 . (27 + 123)
S33 = 33/2 . 150
S33 = 2.475