Digital Electronics
11001, 1001 and 111001 correspond to the 2’scomplement representation of the following set of numbers

 -25, -9 and -57 respectively
 25, 9 and 57 respectively
 -6, -6 and -6 respectively
 -7, -7 and -7 respectively

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

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