Exercise 2.2.2 d

[Abhilekhgautam]

How does S -> a S b S | b S a S | epsilon has equal number of a and b?

            S -> a S b S
                -> a a S b S

Now if I used an empty string I'd get 2 a's and 1 b's.

[Abhilekhgautam]

my bad.. made a bluneder S -> a S b S -> a a S b S b S

so we have same number of a's and b's.