Design a circuit that outputs 0 if the two 4-bit numbers input are not equal and outputs 1 if they are equal. 2. use two 4x1 multiplexers to implement a full adder 3. for function f (a, b, c) = (a + b)' c+ abc'+ac implement f by means of 8-to-1 multiplexer a. b. implement f by means of a 3-to-8 decoder no hand written design using the program.