b1=6,4
b2=3,2
q=b2/b1=1/2
b(n)=b1*q^(n-1)
0.05=6,4*(1/2)^(n-1)
(1/2)^(n-1)=0.05:6,4
(1/2)^(n-1)=1/20:(32/5)=1/128=(1/2)^7
n-1=7
n=8
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Answers & Comments
b1=6,4
b2=3,2
q=b2/b1=1/2
b(n)=b1*q^(n-1)
0.05=6,4*(1/2)^(n-1)
(1/2)^(n-1)=0.05:6,4
(1/2)^(n-1)=1/20:(32/5)=1/128=(1/2)^7
n-1=7
n=8