Digital Electronics
In decimal number system what is MSD

 Middle digit
 First digit from left to right
 First digit from right to left
 Mean of all digits

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