The mathematical property demonstrated is called the Commutative Property of Addition. This rule states that we can "commute" (to move around) the values wherever we want or in any order and the sum will always stay the same, just as long as the sign is either addition or multiplication.
Answer: The translation: is "a die with 6 faces numbered from 1 to 6 and thrown in a random way is desired to fall face up. What is the probability of obtaining the face with one of the desired values"