Exam-style question
Try this first
A system uses even parity. The data bits are 1011001. Which parity bit should be added?.
- A.0, because the data already contains an even number of 1s
- B.1, because the data already contains an even number of 1s
- C.0, because the data contains an odd number of 1s
- D.1, because the parity bit is always 1
Model answer
What a good answer should say
- 0, because the data already contains an even number of 1s
Explanation
Why this works
The data contains four 1s, which is already even. Adding a parity bit of 0 keeps the total number of 1s even.
Common mistake
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