Question: 1. Using half adders and/or full adders as building blocks, design: a. A 4-bit incrementer (a circuit that adds one to a 4-bit number) b.

1. Using half adders and/or full adders as building blocks, design: a. A 4-bit incrementer (a circuit that adds one to a 4-bit number) b. A 4-bit decrementer (a circuit that subtracts 1 from a 4-bit number) 2. Design a full-subtractor using only half-adders, inverters and one OR gate. No other external gates are provided.

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