Question:
Which of the following is NOT a binary number?
Which of the following is NOT a binary number?
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A number can only belong to a base-$N$ number system if all of its individual digits are strictly less than $N$.
Updated On: Aug 24, 2026
- 001
- 010
- 011
- 012
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Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Step 1: Understanding the Concept:
The binary number system (base-2) is a positional numeral system that represents numeric values using only two unique symbols: 0 and 1.
Step 2: Detailed Explanation:
Let us evaluate each option:
- (A) 001: Consists only of digits 0 and 1, which are valid binary digits.
- (B) 010: Consists only of digits 0 and 1, which are valid binary digits.
- (C) 011: Consists only of digits 0 and 1, which are valid binary digits.
- (D) 012: Contains the digit '2', which is not a valid symbol in a binary (base-2) system.
Therefore, 012 is not a binary number.
Step 3: Final Answer
The correct option is (D).
The binary number system (base-2) is a positional numeral system that represents numeric values using only two unique symbols: 0 and 1.
Step 2: Detailed Explanation:
Let us evaluate each option:
- (A) 001: Consists only of digits 0 and 1, which are valid binary digits.
- (B) 010: Consists only of digits 0 and 1, which are valid binary digits.
- (C) 011: Consists only of digits 0 and 1, which are valid binary digits.
- (D) 012: Contains the digit '2', which is not a valid symbol in a binary (base-2) system.
Therefore, 012 is not a binary number.
Step 3: Final Answer
The correct option is (D).
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