A number is an irrational if and only if its decimal representation is

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Non terminating

Non terminating and repeating

Non terminating and non repeating

Terminating

answer is C.

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Detailed Solution

It is given an irrational number.
According to definition of irrational number, if written in decimal notation, an irrational number would have an infinite number of digits to the right of the decimal point, without recurring digits.
Hence, a number having non terminating and non-repeating decimal representation is an irrational number.
So, option 3 is correct.

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