$$Exercise

$3$

$.$

$1$

$.$

$3$

: Write regular expressions for the following languages:

c

$)$

$$The set of strings of

$0$

$\text{'}$

s and

$1$

$\text{'}$

s whose number of

$0$

$\text{'}$

s is divisible by five and whose number of

$1$

$\text{'}$

s is even.