This is the basic and conceptual question from real numbers in which we have given a number √21 and we have been asked to show that the given number is a rational number or irrational number
Kindly give me a detailed solution of this question
RS Aggarwal, Class 10, chapter 1D, question no 2(ix)
As we know 21 is not a perfect square.
Therefore, 21 is irrational.