Jawabanmu

2014-07-13T23:49:30+07:00
 S_{n} =  \frac{a(1- r^{n}) }{1-r}
 S_{6} =  \frac{2(1- ( \frac{1}{2} )^{6}) }{1- \frac{1}{2} }
 S_{6} =  \frac{2(1-\frac{1}{64}) }{\frac{1}{2} }
 S_{6} =  2.2( \frac{63}{64} ) = 4( \frac{63}{64} )=  \frac{63}{16} = 3,93

mungkin seperti itu, jika ada yg salah mohon dikoreksi ya
2014-07-14T00:14:01+07:00
2, 1, 1/2, 1/4, 1/8, 1/16, 1/32, 1/64, 1/128, 1/256, 1/512, 1/1024,.....................
kan yang diminta 6 suku pertamanya, ya yang diatas....