Final answer:
The equation 3(mn) - (3m)n illustrates the distributive property in mathematics.
Step-by-step explanation:
The property illustrated by the equation 3(mn) - (3m)n is the distributive property. This property states that when multiplying a number by a sum or difference in parentheses, you can distribute the multiplication to each term inside the parentheses. In this equation, 3 is being multiplied by (mn) and (3m) separately, and then subtracted.
Learn more about Distributive property in mathematics