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

 four literals less than the total number of variables
 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

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

logic 0 voltage level is lower than logic 1 voltage level.
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

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