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a/(1-r)=6
Untuk suku2 ganjil, rasionya r² sehingga
a/(1-r²)=4
Perhatikan bahwa
a/(1-r²) = 1/(1+r)*a/(1-r)
4 = 1/(1+r)*6
4/6 = 1/(1+r)
1+r = 6/4 → r = 1/2
a/(1-r) = a/(1/2) = 6 → a=3
Suku ke-6
a*r^5 = 3*(1/2)^5 = 3/32