Digital Electronics
Which of the following notations have two representations of zero? (I) 1’s complement with radix of number being 2 (II) 7’s complement with radix of number being 8 (III) 9’s complement with radix of number being 10 (IV) 10’s complement with radix of number being 10 Select the correct answer using the codes given below:

 (I), (II) & (III)
 (I) & (III)
 (II), (III) & (IV)
 (I), (II) & (IV)

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

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
logic 0 and, -1 are represented by negative and positive voltages respectively

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