Let G Be the Phrase-Structure Grammar with Vocabulary $P = \{ S \rightarrow A B a , S \rightarrow B a , A \rightarrow a B , A B \rightarrow b , B \rightarrow a b \}$

Short Answer

Let G be the phrase-structure grammar with vocabulary V={A, B, a, b, S} , terminal element set T={a, b} start symbol S , and production set $P = \{ S \rightarrow A B a , S \rightarrow B a , A \rightarrow a B , A B \rightarrow b , B \rightarrow a b \}$
derivable from A ?
(1) babaa,
(2) aab ,
(3) bba .