Question

Hitung Jumlah deret 1 + 6 + 36 + ... + 7.776

Answer 1

A = 1
r = 6
Un = 7776
Un = ar^n-1
7776 = 1.6^n-1
7776 = 6^5
n = 6
Sn = a(r^n - 1 ) / r-1
     = 1(6^6  - 1) / 5
     = (46656-1) / 5
Sn = 9331