solve the question no 1 and also explain the answer - Maths - Real Numbers

Question

solve the question no 1

and also explain the answer

Arun · Answer

Please find this answer
<img src=
"https://s3mn%20mnimgs%20com/img/shared/content_ck_images/ck_5e4bb9c72138a%20png">

solve the question no. 1. and also explain the answer.