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

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

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Digital Electronics
In case of OR gate, no matter what the number of inputs, a

0 any input causes the output to be at logic 0
1 at any input causes the output to be at logic 1
1 at any input causes the output to be at logic 0
0 at any input causes the output to be at logic 1.

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