Digital Electronics
OR-AND realization of a combinational circuit is equivalent to

 NAND-NOR realization
 NAND-NAND realization
 NOR-NOR realization
 NOR-NAND realization

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Digital Electronics
In K-map simplification, a group of four adjacent 1s leads to a term with

 one literal less than the total number of variables
 three literals less than the total number of variables
 two literals less than the total number of variables
 four literals less than the total number of variables

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