Draw full adder circuit by using XOR, AND and OR gates instead of a block. 3 Input gates can be used. 1. 2. Draw a block diagram for a single full adder/subtractor module. Combine 4 block diagrams to draw a complete 4-bit adder/subtractor circuit. 3. Remember, since binary numbers work from the LSB on the right to the MSB on the left, it m outputs on the left. . akes more sense for the blocks to have inputs on the right side and the