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Digital Arithmetic Operations and Circuits
To make an eight-bit adder from two four-bit adders you must connect ________.
the high-order carry-in to ground
the low-order carry-out to the high-order carry-in
the high-order carry-out to ground
the low-order sum to the high-order data input
Correct Answer:
the low-order carry-out to the high-order carry-in
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