Jawabanmu

2014-03-25T21:22:50+07:00
S5 = a  \frac{( r^{5 } -1 )}{r-1} =  a \frac{ (4^{5} - 1) }{3} = 2046

a =  \frac{3x2046}{( 4^{5} -1)} = 6

U6 = a× r^{5} = 6× 4^{5} = 6144
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