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1. Design a circuit that multiplies two 2-bit numbers in a signed binary system. 2. Design a circ...

1. Design a circuit that multiplies two 2-bit numbers in a signed binary system.
2. Design a circuit that tells the number of "1's" in single digit BCD.
3. Consider to represent a hexadecimal number using a 7-segment device. how to do? (Draw a truth sheet too.
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