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ar4=243
r2=9
r=3
ar2=27
a(3)2=27
a9=27
a=3
a adalah suku pertama
Suku ke lima = ar^4 = 243
ar^4 / ar^2 = 243/27
(gunakan sifat aljabar)
r^2 = 9
r = √9
r= 3
ar^2 = 27
a . 3^2= 27
a . 9 = 27
a = 3
suku pertama = 3