Which of the following is a binary number?

Q. Which of the following is a binary number?
Answer: 100101
Notes: The binary number system is a numbering system that represents numeric values using two unique digits (0 and 1). The numbers from 0 to 10 are thus in binary 0, 1, 10, 11, 100, 101, 110, 111, 1000, 1001, and 1010.

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