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Bab Barisan dan DeretMatematika SMP Kelas VIII
Geometri
r = ⁴⁻¹√(54 : 2)
= ∛27
= 3
Un = 4.374
a x rⁿ⁻¹ = 4.374
2 x 3ⁿ⁻¹ = 4.374
3ⁿ⁻¹ = 4.374 : 2
3ⁿ⁻¹ = 2.187
3ⁿ⁻¹ = 3⁷
n - 1 = 7
n = 7 + 1
n = 8