Digital Electronics
The maximum positive and negative numbers which can be represented in two’s complement form using n bits are respectively,

 +2n-1,-(2n-1+1)
 +(2n-1-1),-2n-1
 +2n-1,-2n-1
 +(2n-1-1),-(2n-1-1)

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Digital Electronics
Positive logic in a logic circuit is one in which

logic 0 and, -1 are represented by negative and positive voltages respectively
logic 0 voltage level is lower than logic 1 voltage level.
logic 0 voltage level is higher than logic 1 voltage level
logic 0 and 1 are represented by 0 and positive voltage respectively

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