A) 1001
B) 1111
C) 1011
D) 1101
E) 1231
Correct Answer: E
Solution :
[e] In mathematics and digital electronics, a binary number is a number expressed in the binary numeral system, or base-2 numeral system, which represents numeric values using two different symbols: typically 0 (zero) and 1 (one). So 1231 is not a binary number.
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