Jawabanmu

Jawaban paling cerdas!
2014-02-02T11:46:24+07:00
A = 16

U4 = ar^3 =128
16. r^3 = 128
r^3 = 8
r = 2

Un = ar^n-1
Un = 16. 2^n-1
Un = 2^4 . 2^n-1
Un = 2^n+3
1 5 1