Bantuinnnn Guys Dik barisan geometri dengan U2=1 DAN U6= 1/16. dit jumlah 6 suku pertama barisan trsbt adalah?? sama caranya ya

[tex]U_6\equiv ar^5=\frac{1}{16} \\ U_2\equiv ar=1 \\ --$Bagikan$-- \\ r^4=\frac{1}{16} \\ r=\pm\frac{1}{2} \\ a_1r_1=1 \\ \frac{1}{2}r_1=1 \\ r_1=2 \\ \\ a_2r_2= 1 \\ -\frac{1}{2}r_2=1 \\ r_2=-2 \\ \\ $Untuk $a=2,r=\frac{1}{2}[/tex]
[tex]\displaystyle S_6=\frac{a(1-r^6)}{1-r}=\frac{2(1-\frac{1}{64})}{1-\frac{1}{2}} \\ S_6=\frac{2(\frac{63}{64})}{\frac{1}{2}}=\frac{63}{16} \\ \\ \\ $Untuk $a=-2,r=-\frac{1}{2} \\ \displaystyle S_6=\frac{a(1-r^6)}{1-r}=\frac{2(1-\frac{1}{64})}{1+\frac{1}{2}} \\ S_6=\frac{2(\frac{63}{64})}{\frac{3}{2}}=\frac{4}{3}\times\frac{63}{64}=\frac{21}{16}[/tex]