Question

Without doing any calculation find the numbers which are not perfect squares.
(i) 153 (ii) 257 (iii) 408 (iv) 441

• A. 153, 257, 408 and 441
  
• B. 153 and 257
  
• C. 153, 257 and 408
  
• D. None of these
  

Answer 1

The correct option is C 153, 257 and 408

$153,257,408$ are surely not perfect square as these numbers end with $3,7,8$

Because any perfect square end with $\mathrm{0.1.4.5.6.9}$

So, only $441$ is a perfect square,

Hence, Option C is correct.