Jumlah sampai tak hingga deret geometri 12+9+27/4+ .....

Kelas 10 Matematika
Bab Barisan dan Deret Bilangan

r = U2/U1
r = 9/12
r = 3/4

S∞ = a/(1 - r)
S∞ = 12/(4/4 - 3/4)
S∞ = 12/(1/4)
S∞ = 12 . 4/1
S∞ = 48