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Sganjil = 2
a/(1 - r²) = 2
1/(1 - r²) = 2
1 - r² = 1/2
-r² = -1 + 1/2
r² = 1/2
r = √1/2
S∞ = 1/(1 - √1/2)
= 1/(1 - 0,71)
= 1/0,29
= 3,45