Question

All of the following are rational except _____.

A. Square root of 2
B. -13
C. 14/15
-
D.81

Answer 1

A. Square root of 2

Explanation:

This answer is an EXTENDED decimal that never seems to stop, but eventually it will have to. All the others can be easily written as decimals and\or fractions [also improper fractions].

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Answer 2

Answer: Option 'A' is correct.

Explanation:

Since we have given that

Rational numbers are those numbers which can be written as p/q form or it must be non terminating but recurring number.

-13 can be written as p/q form as
`(-13)/(1)`

`(14)/(5)` is a rational number because of its form.

81 can be written in p/q form as
`(81)/(1)`

But √2 is non terminating and non recurring number.

Hence, √2 is not a rational number.

Therefore, Option 'A' is correct.