Exam-style question
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Which binary fraction has the decimal value 0.625?.
- A.0.011
- B.0.101
- C.0.110
- D.1.001
Model answer
What a good answer should say
- 0.101
Explanation
Why this works
The binary fraction 0.101 represents 1/2 + 0/4 + 1/8, which equals 0.625. It can therefore be represented exactly when enough bits are available.
Common mistake
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