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a = 21
Un = 99
b = 3
Ditanya :
Sn?
Jawab :
Un = a + (n - 1)b
99 = 21 + (n - 1)3
99 = 21 + 3n - 3
99 = 3n + 18
3n = 81
n = 27
Sn = (a + Un)
S27 = (21 + 99)
S27 = 13,5(120)
S27 = 1.620