5 The third term of an arithmetic progression is 24 . The tenth term is 3.
Find the first term and the common difference.
Find also the sum of the 21 st to 50 th terms inclusive.
Simplify
- Find the 51st term of the sequence given by
$$\begin{aligned}
u _ { 1 } & = 5
u _ { n + 1 } & = u _ { n } + 4
\end{aligned}$$ - Find the sum to infinity of the geometric progression which begins
$$5 \quad 2 \quad 0.8 \quad \ldots .$$