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a = 10
a = 10
r = U2/U1 = 2/10 = 1/5
Ditanya : S∞..?
Penyelesaian :
S∞ = a / (1 - r)
S∞ = 10 / (1 - 1/5)
S∞ = 10 / (4/5)
S∞ = 10 x 5/4
S∞ = 50/4
S∞ = 25/2