## UP Board Solutions for Class 10 Maths Chapter 1 Exercise 1.3 Real Numbers

EXERCISE 1.3 Sol. Let us assume, to the contrary, that is rational.Now, let , where a and b are coprime and Squaring on both sides, we get => … (1) This shows that is divisible by 5.It follows that a is divisible by 5 … (2)=> a = 5m for some integer m. Substituting a …