Question

without doing any calculation, find the numbers which are surely not perfect squares.
i) 153 ii) 257 iii) 408 iv) 441​

Answer 1

: Required Answer

➝ We know that natural numbers ending with the digits 0, 2, 3, 7 and 8 are not perfect square.

i. 153⟹ Ends with 3.

153 is not a perfect square

ii. 257⟹ Ends with 7

257 is not a perfect square

iii. 408⟹ Ends with 8

408 is not a perfect square

iv. 441⟹ Ends with 1

441 is a perfect square.