Level:
Project ID:
1003097003
Source Problem:
Accepted:
1
Clonable:
1
Easy:
0
Find the sum of the first five terms of an arithmetic sequence \( \left\{a_n\right\}_{n=1}^{\infty} \), if:
\[ \begin{aligned}
a_1\cdot a_4&=100 \\
a_2+a_6&=10
\end{aligned} \]
\( 50 \)
\( 0 \)
\( 20 \)
\( -5 \)
\( 90 \)