Level:
Project ID:
1003134709
Accepted:
1
Clonable:
0
Easy:
0
Find the sum of the second and the third term of the geometric sequence \( \{a_n\}_{n=1}^{\infty} \), if: \[ \begin{aligned} a_1-a_2&=b, \\ a_1+a_2&=-3b, b\in\mathbb{R}. \end{aligned}\]
\( -6b \)
\( -5b \)
\( -3b \)
\( -2b \)
\( 2b \)