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dengan: a atau U1 = 1
b atau beda = 2
Un = 29
Un = a + (n - 1 ) b
29 = 1 + ( n - 1 ) 2
29 = 1 + 2n - 2
29 = 2n - 1
30 = 2n
n = 15
Sn =
S15 =
S15 =
S15 =
S15 = 15(15)
S15 = 225