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

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Digital Electronics
In case of OR gate, no matter what the number of inputs, a

1 at any input causes the output to be at logic 1
1 at any input causes the output to be at logic 0
0 at any input causes the output to be at logic 1.
0 any input causes the output to be at logic 0

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