Barisan geometri
[tex]un = \frac{1}{512} \\ a = 2 \\ r = \frac{1}{2} \\ \\ un = a \times {r}^{n - 1} \\ \frac{1}{512} = 2 \times {( \frac{1}{2} )}^{n - 1} \\ (\frac{1}{2}) {}^{9} \times \frac{1}{2} = ( { \frac{1}{2} )}^{n - 1} \\ ( { \frac{1}{2}) }^{10} = ( { \frac{1}{2}) }^{n - 1} \\ 10 = n - 1 \\ 10 + 1 = n \\ n = 11[/tex]
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Barisan geometri
[tex]un = \frac{1}{512} \\ a = 2 \\ r = \frac{1}{2} \\ \\ un = a \times {r}^{n - 1} \\ \frac{1}{512} = 2 \times {( \frac{1}{2} )}^{n - 1} \\ (\frac{1}{2}) {}^{9} \times \frac{1}{2} = ( { \frac{1}{2} )}^{n - 1} \\ ( { \frac{1}{2}) }^{10} = ( { \frac{1}{2}) }^{n - 1} \\ 10 = n - 1 \\ 10 + 1 = n \\ n = 11[/tex]