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Which of the following is not a binary number?

A. 001
B. 101
C. 202
D. 110
Correct Answer: C. 202
Explanation:


The correct answer is 202 because a binary number system is based on only two digits: 0 and 1.



    • Binary System: It is a base-2 number system used in computers for all internal processing.

    • Valid Binary Digits: Only 0 and 1 are allowed in binary representation.

    • Why 202 is Incorrect (Binary-wise): The digit '2' is not part of the binary system, so 202 cannot be a valid binary number.

    • Why Other Options Are Correct:

      • 001, 101, and 110 contain only 0s and 1s, so they are valid binary numbers.




$ and $.

  • Step 1 (Binary Logic): Digital computing systems operate on dual-state electronics (on/off). This logic is mapped directly using a radix base of simple_quiz$, meaning each digit position in a binary string can only ever express a value of
    A. 001
    B. 101
    C. 202
    D. 110
    Correct Answer: C. 202
    $ or $.
  • Step 2 (Evaluation): Examining the number **202** reveals the inclusion of the digit simple_quiz$, which is an invalid digit that violates base-2 notation rules (belonging instead to base-10 decimal or higher numbering systems).
  • Incorrect Options:
    • 001 is a perfectly valid 3-bit binary sequence containing only zeros and ones.
    • 101 is a valid binary integer representation (equivalent to the decimal number $).
    • 110 is a valid binary integer sequence (equivalent to the decimal number $).

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