MOCK TEST compiler design

Question

Consider the given below grammar
S→ cAd
A→ bA | aA | b
If a recursive descent parser is used for string “cbababd” then number of back trackin worst case is:

Comments

given ans is 10

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i also wrote the same test series check the solution i think its right we can randomly apply all the productions at one stage so that it wont match (inorder to get the worst case

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which test series is this?

Answer 1

 

So 10 is the answer in the worst case.