GateForum Mock Test

Question

The given answer is A) 

but option A) produces the string "ab" which is not produced by the above grammar so how can the answer be A) ?

Comments

Both are generating the ab infect genrating the same language.

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S-->SaSbS

S-->ab

is the question, Both Question and Ans Genrate "ab".

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Ahh , got my mistake :)