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u8= 384
r^4/r^7=48/384
r^3= 8
r=2
a.2^4=48
a.16=48
a=3
sn= a(r^n-1)/r-1
s10= 3(2^10-1)/2-1
= 3(1024-1)/1
= 3. 1023
= 3.069
U5 => a x r ⁴ = 48 di bagi
r³ = 8
r = 2
a x r⁴ = 48
a x 2⁴ = 48
a x 16 = 48
a = 48/16
a = 3
jumlah 10 suku
jawabannya 3069