Question

A child is given $3$ numbers. $8,15,20$ and asked to find out the smallest square number, which each can divide.

• A. $1900$
• B. $1500$
• C. $2000$
• D. $3600$

Answer 1

Answer: (D)

$3600$

L.C.M $=2\times 2\times 2\times 5\times 3=120$
$2,3,5$ are not in pairs, so the product of these no have to multiplied to get the perfect square
$=120\times 30=3600.$
Therefore, $D$ is the correct answer.