a)

$a_n=\frac{1}{n^2}$  

$0,01>\frac{1}{n^2}$  

$\frac{1}{100}>\frac{1}{n^2}$  

$\frac{1}{{10}^2}>\frac{1}{n^2}$  

Odp.  $n\in \left\{11,12,13,14,15,\text{...}\right\}$  

 

b)

$a_n=\frac{1}{n^2}$  

$0,0001>\frac{1}{n^2}$  

$\frac{1}{10000}>\frac{1}{n^2}$  

$\frac{1}{{10}^4}>\frac{1}{n^2}$  

Odp.  $n\in \left\{101,102,103,\text{...}\right\}$  

 

c)

$a_n=\frac{1}{n^2}$  

$0,000001>\frac{1}{n^2}$  

$\frac{1}{1000000}>\frac{1}{n^2}$  

$\frac{1}{{10}^6}>\frac{1}{n^2}$  

Odp.  $n\in \left\{1001,1002,1003,\text{...}\right\}$