Analyze the Number Sequence: Properties of 10, 8, 6, 4, 2

To solve this problem, we need to analyze whether the set of numbers $10, 8, 6, 4, 2$ has a pattern or property.

• Step 1: Observe the difference between consecutive terms:
  $8 - 10 = -2$
  $6 - 8 = -2$
  $4 - 6 = -2$
  $2 - 4 = -2$
• Step 2: Analyze the result.
  We see that the difference between consecutive terms is consistently $-2$.

This indicates that the terms form an arithmetic sequence with a common difference of $-2$.

Hence, the property of this set of numbers is that it is an arithmetic sequence with a common difference of $-2$.

By comparing the possible answer choices, we confirm that the correct choice is number 1: $-2$.