Question

The least number which is a perfect square and is divisible by each of $16,20$ and $24$ is:

• A. $240$
• B. $1600$
• C. $2400$
• D. $3600$

Answer 1

The correct option is D $3600$

$16=2^4$
$20=2^2\times 5$
$24=2^3\times 3$
Least perfect square can be $2^4\times 5^2\times 3^2=16\times 25\times 9=3600$
Option D