Digital Electronics
A D-flip-flop is said to be transparent when

 the output is HIGH
 the output follows clock
 the output follow input
 the output is LOW

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

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