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Bab Barisan dan DeretMatematika SMP Kelas VIII
Geometri
a = 6
r = U2 : U1
= 18 : 6
= 3
Un = a x rⁿ⁻¹ = 4.374
6 x 3ⁿ⁻¹ = 4.374
3ⁿ⁻¹ = 4.374 : 6
3ⁿ⁻¹ = 729
3ⁿ⁻¹ = 3⁶
n - 1 = 6
n = 6 + 1
n = 7