Digital Electronics
Consider the representation of six-bit numbers by two’s complement, one’s complement, or by sign and magnitude: In which representation is there overflow from the addition of the integers 011000 and 011000?

Two’s complement and one’s complement only
Sign and magnitude and one’s complement only
Two’s complement only
All three representations

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Digital Electronics
Positive logic in a logic circuit is one in which

logic 0 and, -1 are represented by negative and positive voltages respectively
logic 0 voltage level is higher than logic 1 voltage level
logic 0 and 1 are represented by 0 and positive voltage respectively
logic 0 voltage level is lower than logic 1 voltage level.

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