If the LCM of A and B is 72 and their HCF is 6, what is the product of A & B? Select.
A) 432 B) 433 C) 434 D) 435 E) 436

Rationale: the most important property of lcm ( the least common multiple ) and gcd ( the greatest common divisors ) is : for any positive integers x and y , x ∗ y = gcd ( x , y ) ∗ lcm ( x , y ) so ab = 72 * 6 = 432 . answer : a
Answer: A