please do (a) and (b). thank youpleasedo both Problem 7. (16 points) Prove that the following languages are not regular. (a) \( L_{1}=\left\{a^{n} b^{2 n} a^{n} \mid n \geq 0\right\} \) (b) \( L_{2}=\left\{a^{3^{p}} \mid p \geq 0\right\} \). Here 1 answer