Ambiguity

Question

Ques.  S --> Aa/bAc/dc

           A --> d
 

Isn't this grammar Ambiguous?

If First(S) has more than one production giving the same first value, isn't it ambiguous?

Comments

No you can't say grammar is ambiguous, just by looking at first of some production, if checking grammar is ambiguous or not is that easy then its won't become an unsolved problem. Always take some input string and check whether multiple parse trees are possible are not.
Above grammar is unambigious, take any input string which is accepted by the grammer, you wont get 2 parse tree.

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Ok got it.

Is this an LL(1)?

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No,  its not LL(1),  Entry [S, d] in LL(1) parsing table will contain 2 entries, so you can't decide what to do when top of the stack is S and next input symbol is d.