Binary subtraction rules

Q.  Which is an incorrect rule of binary subtraction from the following?
- Published on 29 Sep 15

a. 0 – 0 = 0
b. 0 – 1 = -1
c. 1 – 0 = 1
d. 0 – 1 = 1 with borrow '1'

ANSWER: 0 – 1 = -1

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