Question

Which one of the following numbers is not a perfect square from $4900,90000,810000,81000$?

• A. $4900$
• B. $90000$
• C. $810000$
• D. $81000$

Answer 1

Answer: (D)

$81000$

$\sqrt{4900}=70$ perfect square

$\sqrt{90000}=300$ perfect square

$\sqrt{810000}=900$ perfect square

$\sqrt{81000}$ is not an integer

$\sqrt{81000}$ is not a perfect square