In which of the following base systems is 123 not a valid number ?
Correct answer: D. Base 3
- A. Base 10
- B. Base 16
- C. Base8
- D. Base 3
Explanation
A base-3 system permits only the digits 0, 1, and 2. Since 3 is not a valid digit in that system, 123 is invalid in base 3.
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