Digital Electronics
Which of these sets of logic gates are designated as universal gates?

 NOR, NAND.
 XOR, NOR, NAND.
 NOR, NAND, XNOR.
 OR, NOT, AND.

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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?

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

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