Which of the following is NOT an octal number?19,77,15,101
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the number which is not an octal number is
15
15
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19 is NOT an octal number.
1. An octal number uses the digits from 0 to 7 and has a base of eight.
2. From the given numbers, only 19 contains a digit greater than 7, i.e. 9. The rest of the digits have numbers from 0 to 7.
3. Hence, 19 is NOT an octal number.
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