()) The unknown numbers below form the start of an arithmetic sequence. $$ a, a-b, a-2 b, a-3 b, \ldots $$ 4) Which expression represents the common difference between consecutive terms? a-b

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To determine the common difference in the given arithmetic sequence:

$$ a, \ a - b, \ a - 2b, \ a - 3b, \ \ldots $$

**Common Difference (d):**  
The common difference $$ d $$ in an arithmetic sequence is the constant amount that each term increases or decreases from the previous term.

Let's calculate the difference between consecutive terms:

1. **First to Second Term:**
   $$
   (a - b) - a = -b
   $$
2. **Second to Third Term:**
   $$
   (a - 2b) - (a - b) = -b
   $$
3. **Third to Fourth Term:**
   $$
   (a - 3b) - (a - 2b) = -b
   $$

As observed, the common difference $$ d $$ is consistently $$-b$$ between each pair of consecutive terms.

**Conclusion:**  
The common difference between consecutive terms in the sequence is:

$$
\boxed{-b}
$$
The common difference between consecutive terms is $$-b$$.

()) The unknown numbers below form the start of an arithmetic sequence. \( a, a-b, a-2 b, a-3 b, \ldots \) 4) Which expression represents the common difference between consecutive terms? a-b

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