solve 5 and 7

5. Design a four-bt combinational circuit 2's complementer. (The output generates the 2's complement of the input binary number.) show that the circut can be constructed with exclusive-or gates. can you predict what the output functions are for a five-bit 2's complementer? 6. Design a combinational circuit that compares two 4-bit numbers to check if they are equal. The crcut output is equal to 1 if the two numbers are equal and o otherwise. 7.Draw the logic diagram of a 2-to-4-line decoder using (a) NOR gates only. (6) NAND gates only. Include an enable input