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u2 =ar = 20
r = 20/100 = 2/10 = 1/5
ar^(n-1) = 0,0064
100. 1/5^(n-1) = 0,0064
100/0,0064 = 5^(n-1)
15.625 = 5^(n-1)
5^6 = 5^(n-1)
6 = n-1
n = 6+1
n = 7