Level:
Project ID:
1003097008
Accepted:
1
Clonable:
0
Easy:
0
Find the first term of an arithmetic sequence \( \left\{a_n\right\}_{n=1}^{\infty} \), if the sum of the first eight terms is $12$ and the sum of the first twelve terms is $-6$:
\[ \begin{aligned}
s_8&=12 \\
s_{12}&=-6
\end{aligned} \]
\( 5 \)
\( -5 \)
\( 2 \)
\( 1 \)
\( -3 \)