Hitunglah: A. U7 dari barisan 5,10,20,40... B. U10 dari barisan 729,243,81,27... Tlong di jawab ya:D

A) dari barisan 5,10,20,40
Suku awal (a) = 5
Rasio (r) = 2
U7 = a.r^n-1 = a.r^6 = 5.2^6 = 5.64 = 320

B) dr barisan 729,243,81,27
Suku awal (a) = 729
Rasio (r) = 1/3
U10 = a.r^9 = 729.(1/3)^9 =729. 1/19683 = 1/27

u7 = 5.2^6
= 320

u10 = 729.1/3^9
= 729.1/19683
= 1/27