Diketahui barisan geometri 4,16,64 ditanya nilau u5+u6

[tex] \\ u5 = ar {}^{n - 1} \\ u5 = 4 \times 4 {}^{5 - 1} \\ u5 = 4 \times 4 {}^{4} \\ u5 = 1024[/tex]