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u2 = 2 = a.r
u2/u1 = a.r/a
r= 2/1
r=2
Un= a. r^(n-1)
2048=1 . 2^(n-1)
2^11= 2^(n-1)
11= (n-1)
n= 11+1
n=12
jadi banyak sukunya adalah 12