Final answer:
The statement (7pmn = 7p(mn)) illustrates the Associative Property of Multiplication, which allows factors to be grouped in any order without changing the product.
Step-by-step explanation:
The property illustrated by the statement (7pmn = 7p(mn)) is the Associative Property of Multiplication. The Associative Property states that terms can be grouped in any fashion when multiplying. This property allows for the grouping of factors in a multiplication equation without changing the product. Thus, multiplying p and mn together first, and then by 7, gives the same result as multiplying 7 and p first, and then by mn.