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a/(1 - r²) = 48
Sganjil = 64
ar/(1 - r²) 64
Sganjil /Sgenap
ar/(1 - r²) = 64
a/(1 - r²) = 48
r = 4/3
a/(1 - r²) = 48
a/(1 - (4/3)²) 48
a/(1 - 16/9) = 48
a/(-7/9) = 48
a = 48(-9/7)
a = -432/7