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a = 100
U2 = 20 --> ar = 20
r = 20/a
r = 20/100
r = 1/5
Un = 0,0064 = 64/10000
jadi 0,0064 adalah suku ke-7
16)
jadi suku ke-10 adalah 1024.
semoga membantu ya :)
U2 = 20
Un = 0,0064
ditanya : n
r =
0,0064 = 100 .
0,000064 =
6 = n - 1
n = 7