Digital Electronics
The set of which logic gates is designated as universal gate?

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

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Digital Electronics
2421 code is

 weighted self-complementing code
 non-weighted and non-self-complementing code
 non-weighted self-complementing code
 weighted non-self-complementing code

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