Tolong jawab dong kakak2 penting nih buat ujian​

U2 = 6

u5 = 48

ar^n-1 = un geometri

48 = ar⁴

6 = ar

———– ÷

8 = r³

2 = r

6 = a(2)

a = 3

U7 = a(r)^6

U7 = (3)(2)^6

3 x 64 = U7

192 = U7

S7 = 3(2^7 – 1)/r -1

S7 = 3(128-1)/2-1

S7 = 3(127)/1

S7 = 381