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Which of the following is NOT a binary number?

1. 120211
2. 10.11
3. 101011
4. 11111

Correct answer: 120211

Solution

Binary number system uses only digits 0 and 1. 120211 contains digit '2' → NOT binary. 10.11 = binary fraction ✓. 101011 = binary ✓. 11111 = binary ✓.

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