Bantu nomor 14,15 dong
Jawaban Terkonfirmasi
14) a = 1/9
r = 3
Un = a
81 = 1/9 .
= 81 : 1/9
= 81 × 9/1
= 729
=
=
n = 7
Jadi, jawabannya B. 7.
15) U2 = 1/2
U6 = 8
= U6/U2
= 8 : 1/2
= 8 × 2
= 16
r = 2
U2 => a . r = 1/2
a . 2 = 1/2
a = 1/2 : 2
a = 1/2 . 1/2
a = 1/4
U10 = a .
= 1/4 .
= 1/4 . 512
= 128
Jadi, jawabannya adalah C.