Jika Un=3^2n-1 maka nilai U2+U4 adalah ...

Un=3⁽²ⁿ⁻¹⁾
U2=3⁽²ˣ²⁻¹⁾
U2=3³
U2=27

U4=3⁽²ˣ⁴⁻¹⁾
U4=3⁷
U4=2187

U2+U4
=27+2187
=2214

Un=3^2n-1
U2 = 3^2x2-1
= 3^3 = 27
U4= 3^2x4-1
= 3^7
= 2.187
U2+U4 = 27+ 2187
= 2.214