hitunglah jumlah deret geometri tak hingga dari 2+1+1/2+1/4

r = U2/U1 = 1/2
S = a/(1 - r) = 2/(1 - 1/2) = 2/(1/2) = 2(2/1)
S = 4

Deret geometri tak hingga

a = 2
r = U2/U1 = 1/2

Dit.
S

Jwb :
S = a / (1 - r)
S = 2 / (1 - 1/2)
S = 2 / (1/2)
S = 2 x 2
S = 4