Question
Insert two numbers between 1 and -27 so that the resulting sequence is a G.P.
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$(2 x-1)^4+4(2 x-1)^3(3-2 x)+6(2 x-1)^2(3-2 x)^2+4(2 x-1)^1(3-2 x)^3+(3-2 x)^4$
$0 . \overline{7}$