Một cấp số cộng có 11 số hạng. Tổng các số hạng là 176.  Hiệu giữa số hạng cuối và số hạng đầu là 30. Tìm cấp số đó
Theo giả thiết có $\begin{cases}S_{11}=176 \\ u_{11}-u_{1}=30 \end{cases}$

$\Leftrightarrow \begin{cases}\frac{11(2u_{1}+10d)}{2}=176 \\ (u_{1}+10d)-u_{1}=30 \end{cases}$

$\Leftrightarrow \begin{cases}2u_{1}+10d=32 \\ 10d=30 \end{cases}$

$\Leftrightarrow \begin{cases}u_{1}=1 \\ d=3 \end{cases}$

Vậy cấp số cần tìm là: 1,4,7,...,31

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