Theory of Computing (csc520)

L₁ = {w : w = a*b*} and L₂ = {w : w = aⁿbⁿ}.  L₁ ∈ RLs, and L₂ ∉ RLs. |RLs| = ℵ₀

See the attachment :There is two problem [1A and 1B]