Question

Regular expression a/b denotes which of the following set?

(a) {a}

(b) {€,a,b}

(c) {a,b}

(d) {ab}

The question was asked by my college professor while I was bunking the class.

Asked question is from Transformation from NFA to DFA topic in chapter Finite Automata and Regular Expression of Compiler

Answer 1

The correct answer is (c) {a,b}

The explanation: Either a is the output or b hence it’s {a, b}.