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(3+√2) belongs to which set?

Answer and explanation

Correct answer: Irrational

The number 3 is rational because it can be written as 3/1, while √2 is irrational; its decimal expansion is non-terminating and non-repeating. A fundamental property is that the sum of a rational number and an irrational number is irrational. To see why, suppose 3+√2 were rational. Subtracting the rational number 3 would then make √2 rational, contradicting the known irrationality of √2. Therefore 3+√2 is irrational, so option A is correct. It cannot be a rational number, integer, or whole number. The fact that the expression contains a radical does not by itself prove the result; the decisive reasoning is the rational-plus-irrational property and the contradiction argument. Thus the number is real, but among the listed choices its most specific correct classification is irrational.

Related tags

Irrational NumbersReal NumbersNumber ClassificationClass 9Number SystemsMathematicsClass 9 Mcq

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