Tentukan deret geometri tak hingga berikut: a).1/3+1/9+1/27+....

Kelas 8 Matematika
Bab Barisan dan Deret Bilangan

r = U2/U1
r = 1/9 : 1/3
r = 1/9 . 3/1
r = 1/3

S∞ = a/(1 - r)
S∞ = (1/3) . (3/3 - 1/3)
S∞ = 1/3 : 2/3
S∞ = 1/3 . 3/2
S∞ = 1/2