Tolonng dibantu yaa dikumpulkan hari ini ​

Penjelasan dengan langkah-langkah:

1. a = 7

r = 14/7 = 2

b. Un = a × r^n – 1

c. Un = a × r^n – 1

U12 = 7 × 2^12 – 1

U12 = 7 × 2^11

U12 = 7 × 2048

U12 = 14336

2. a. Un = a × r^n – 1

U8 = 81 × 1/3^8-1

U8 = 81 × 1/3^7

U8 = 81 × 1/2187

U8 = 1/27

b. Sn = (a(1 – r^n))/(1-r)

S10 = (81(1 – 1/3^10))/(1-1/3)

S10 = (81(1 – 1/59049))/(2/3)

S10 = (81(59048/59049))/(2/3)

S10 = 59048/729 × 3/2

S10 = 29524/243

S10 = 121 121/243