Digital Electronics
The voltage levels for positive logic system

 may be positive or negative
 must necessarily be positive
 must necessarily be 0 V and 5 V
 must necessarily be negative

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Digital Electronics
Statement(A): 2’s complement arithmetic is preferred in digital computers. Statement(R):The Hardware required to obtain the 2’s complement of a number is simple.

 Both A & R are true but R is not the correct explanation of A
 A is true but R is false
 A is false but R is true
 Both A & R are true and R is the correct explanation of A

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