Dari barisan:64,32,16,8,… Tentukan:nilai U8+U10. Tolong di jawab dengan benar

Menggunakan baris geometri
Un = ar^n-1
U1 = 64
U2 = 32
Rasio = U2/U1 = 1/2
U8 = 64 x (1/2)^8-1 = 64 x (1/2)^7 = 64 x 1/128 = 1/2
U10 = 64 x (1/2)^10-1 = 64 x (1/2)^9 = 64 x 1/512 = 1/8
U8 + U10 = 1/2 + 1/8 = 4/8 + 1/8 = 5/8