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Which of the following is not a binary number?

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Which of the following is not a binary number?

(a) 1111

(b) 101

(c) 11E

(d) 000

I have been asked this question in a national level competition.

This intriguing question comes from The Binary Number System topic in chapter Number Systems of Computer Fundamentals

1 Answer

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Best answer
Correct answer is (c) 11E

For explanation: A binary number can have only two possible digits, 0 and 1. In the third option, there is an alphabet E present which makes it an invalid binary number. Alphabets are only allowed in the hexadecimal number system.

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