Consider the following regular expression over alphabet Σ = {a,b,c}:  Σ∗a+Σ∗bc Provide two strings that are in the language L and two strings that are not in the language L. w∈L: w∈L: w /∈L: w /∈L:

Find a regular expression for L = {ab"w:n > 4, w € {a,b}*}.

Which of the following best describes the set of strings that are Boolean expressions (e.g., "not p or (q and r)"), with the precedence rules 'not' > ‘and' > ‘or' for the three logical operators, left-associativity is supported, and sub- expressions in parentheses are also allowed? A. {S→E, E→T|E or T, T→FIT and F, F→ G | not G, G → (E) I plq|r} B. { S→ E, E →TIE and T, T→ FIT or F, F→ G | not G, G → (E) I plq|r} C. {S → El not E, E → TIE and T, T→FIT or F, F→ (E) I plq|r} D. {S → El not E, E→TI E or T, T→FIT and F, F→ (E) Ip|q|r}

None