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U₃= 3³ = 27
U₃= 3² = 9
U₁₀=3 ⁴⁻ ¹⁰⁻¹
=3 ⁴⁻⁹
=3⁻⁵
=1/243
Cari rasio!
= U2/U1
= 27/81
= 1/3
Un = a*r^(n-1)
U10 =81*1/3^(10-1)
U10 = 81*1/3^9
U10 = (3^4*3^(-9))
U10 = 3^-5
U10 = 1/243
Selesai!