Digital Electronics
The voltages corresponding to LOW and HIGH levels respectively are given below. Identify the voltages which correspond to positive logic system.

 5 V and 0 V
 –1.5 V and – 5 V
 1 V and -5 V
 0 V and 5 V

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

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