Digital Electronics
In binary number system the first digit (bit) from right to left is called as

 Last Bit
 LSB, Least Significant Bit
 First Bit
 MSB, Most Significant Bit

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

 one literal less than the total number of variables
 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

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