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Which of the following is not an irrational number?

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answer is D.

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Detailed Solution

Concept- Irrational numbers are indeed the real numbers that cannot be expressed as fractions.
We know that adding or subtracting any number from an irrational number yields an irrational number.

are irrational numbers, but

is a rational number
Therefore,

is not an irrational number.
Hence, the correct answer is option 4)

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