jumlah deter gepmetri tak hingga 36 + 18 + 9 + 9/2 + ....

Kelas 8 Matematika
Bab Barisan dan Deret Bilangan

r = U2/U1
r = 18/36
r = 1/2

S∞ = a/(1 - r)
S∞ = 36/(2/2 - 1/2)
S∞ = 36/(1/2)
S∞ = 72