Write regular expressions for the following languages on $\{0,1\}$ :

$($a$)$ All strings ending in $10.$

$($b$)$ All strings not ending in $10.$

$($c$)$ All strings containing an odd number of $0\text{'}$s$.$

Find regular expressions for the following languages on $\{a,b\}$ :

$($a$)L=\{w$:$|w|mod30\}.$

$($b$)L=\{w$:$n_a(w)mod3=0\}.$

$($c$)L=\{w$:$n_a(w)mod5>0\}.$