531. a) Ei ole.
b) On.
c) Ei ole.
d) Ei ole.


532. a) [[$\left\{ \begin{array}{1}a_1=99\\a_n=a_{n-1}-2,6, n=2,3,4,...\end{array}\right.$]]

b) [[$\left\{ \begin{array}{1}a_1=\sqrt{49}\\a_n=a_{n-1}+5, n=2,3,4,...\end{array}\right.$]]

c) [[$\left\{ \begin{array}{1}a_1=11,011\\a_n=a_{n-1}-0,01, n=2,3,4,...\end{array}\right.$]]


533. a) [[$a_{100}=-2295$]]

b) [[$a_{100}=-709$]]

c) [[$a_{100}=165\frac{2}{3}$]]


534. a) [[$3k$]]
b) [[$32k^2$]]
c) [[$-2 \sqrt{k}$]]


535. [[$a_2=\frac{1}{5}$]]
[[$a_3=1$]]
[[$a_4=1\frac{4}{5}$]]


536. [[$a_2=10\frac{4}{9}$]]
[[$a_3=17\frac{4}{9}$]]
[[$a_4=24\frac{4}{9}$]]


537. [[$a_1=4\frac{1}{2}$]]
[[$a_2=5$]]


538. [[$9$]]


539. [[$-112\frac{1}{7}$]]


540. a) [[$138$]]
b) [[$1227$]]


541. a) Ei.
b) [[$397.$]] jäsen


542. [[$9226$]]
a) [[$55.$]] jäsen


543. l


544. s