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| Q. |
Half-adders have a major limitation in that they cannot |
| A. | accept a carry bit from a present stage |
| B. | accept a carry bit from a next stage |
| C. | accept a carry bit from a previous stage |
| D. | accept a carry bit from the following stages |
| Answer» C. accept a carry bit from a previous stage | |
| Explanation: half-adders have a major limitation in that they cannot accept a carry bit from a previous stage, meaning that they cannot be chained together to add multi-bit numbers. however, the two output bits of a half-adder can also represent the result a+b=3 as sum and carry both being high. | |
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