Jawaban:
a = 1
b = 4 - 1 = 3
Un = a + ( n - 1) b
Un = 1 + ( n -1) 3
Un = 1 + 3n - 3
Un = 3n + 1 -3
Un = 3n - 2
U20 = 3(20) - 2
U20 = 60 - 2
U20 = 58
U25 = 3(25) - 2
U25 = 75 - 2
U25 = 73
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Jawaban:
a = 1
b = 4 - 1 = 3
Un = a + ( n - 1) b
Un = 1 + ( n -1) 3
Un = 1 + 3n - 3
Un = 3n + 1 -3
Un = 3n - 2
U20 = 3(20) - 2
U20 = 60 - 2
U20 = 58
U25 = 3(25) - 2
U25 = 75 - 2
U25 = 73