Question: A student was asked to generate a regular expression to denote the student letter grades that recognize al the strings made up of the symbols

A student was asked to generate a regular expression to denote the student
letter grades that recognize al the strings made up of the symbols {A, B, C, D, F} with no more than two F grades. He designed the following:
(A +B +C +D)*F(A +B +C +D)*F
But the Professor found that ti is incorrect. i. Why is it incorrect?
Debug the incorrect regular expression to accept the language.

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