Which of the following rational numbers is in the standard form?

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None of these

answer is B.

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Detailed Solution

Concept: In other words, a set of integers is a subset of a set of rational numbers. A fractional expansion of a rational number [3]always ends after a finite number of digits or starts repeating the same finite number of digits sequence. This is called a non-terminating recurring decimal expansion.
If the denominator is a positive integer and the numerator and denominator have no common divisor other than 1, then the rational number is in canonical form.
Now let's get down to the question.
For option (1), the denominator is negative.
For option (2), the denominator is positive and the numerator and denominator have no common factor other than 1.
For option (3), the denominator is negative.
Hence, the correct answer is option (2).

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