Digital Electronics
The difference between the diagram of a NOR and OR gate is

 NOR has got a bubble at its output terminal
 OR is more squared than NOR
 OR has got a bubble at its output terminal
 OR is more oval than NOR

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

 three literals less than the total number of variables
 four 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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