Digital Electronics
An AND gate can be imagined as

 transistors connected in series
 switches connected in series
 switches connected in parallel
 transistors connected in paralle

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

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

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