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maka
48_ _ 384
u4=ar^3
384=48.r^3
384/48=r^3
8=r^3
r=2
ok r suda dapat
u5=ar^4
48=a(2^4)
48=16a
a=2
ok a suda dapat
u2=ar
u2=2.2
u2=4
maka 2 suku pertama adalah
2+4=6