Question

Ratia progresiei geometrice 2;-4;8;-16;32...este
a)1 b)-1 c)-2 d)2

Answer 1

Pai imparti un termen cu cel precedent:
$\frac{ a_{2} }{a_{1}} = \frac{-4}{2} =-2 \Rightarrow q = -2$

Deci c) - 2.