Question

Latihan ujian.. mohon bantuannya :v

Answer 1

Un = ar^n-1

ar^n-1 = 5.120
5 . 2^n-1 = 5.120
2^n-1 = 1.024
2^n-1 = 2^10
n-1 = 10
n = 11

Jawabannya D