engineering recuitment ISRO Scientist Computer Science Mock Test Compiler Design Grammar Left Recursive

Which one of the following grammars is free from left recursion?

1

S → AB

A → Aa | b

B → c
2

S → Ab | Bb | c

A → Bd | ϵ

B → e
3

S → Aa | B

A → Bb | Sc | ϵ

B → d
4

S → Aa | Bb | c

A → Bd | ϵ

B → Ae | ϵ
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