What is the smallest positive perfect square that is divisible by 9, 21, and 49? Choose one: A) 225 B) 324 C) 441 D) 529 E) 900
The number needs to be divisible by 3^2, 3*7, and 7^2.   The smallest such perfect square is 3^2*7^2 = 441   The answer is 441.
<result>C</result>
What is the smallest positive perfect square that is divisible by 9, 21, and 49?