Which of the following is not a binary number? a) 1111 b) 101 c) 11E d) 000

Which of the following is not a binary number? a) 1111 b) 101 c) 11E d) 000
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Answer: c 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 hexadecimal number system
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