TENTUKA BANYAK SUKU UNTUK SETIAP BARISAN BERIKUT A. 5, 15, 45,...., 32805 B. 36, 6, 1,...., 1/7776 C. -1/2, 1, -2,..., -512

1. Un = ar^n-1
32805 = 5.3^n-1
6561 = 3^n-1
³log 6561 = n-1
8 = n-1
n = 8+1
n = 9

2. Un = ar^n-1
1/7776 = 36(1/6)^n-1
1/216 = (1/6)^n-1
1/6log 1/216 = n-1
3 = n-1
n = 3+1
n = 4

3. Un = ar^n-1
-512 = -1/2(-2)^n-1
1024 = -2^n-1
-2log 1024 = n-1
10 = n-1
n = 10+1
n = 11