Assume L$1=\{$a$^$n b$^$n $|$ n $>=0\}$ and L$2=\{$ab$,$aa$\}$

$1$a what are the string beloning to L$1$ when n$=0$ and n$=3$

$1$b what is l$2-$l$1$

$1$c what is $($L$2-$L$1)^$R

Problem $2$

For the following grammar, show the derivation of the string aaabbb

s$->$ aAb$|$ lambda

A $->$ aAb$|$ lambda