2. Design a 4-bit binary decrementer with four half-adders. The decrementer should subtract 1 from the 4-bit input and provide the 4-bit output result. Only Half-adders and inverters can be used in your design.

3. Design a circuit that multiplies an 4 bit number by 3 using only one 4-bit adder and one half adder.

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ANSWER: 2)     By adding 1111 (2's complement form of -1) to the 4-bit input and ignoring the final carry, I'm able to get the decremented value of the input in S3 S2 S1 S0 using a half adder. 3)    Best answer   let the Four bit multiplicand be 111111 and three  bit multiplier be 1111                                                               111111                                                          u2217u2217    1111                                                     ... See the full answer