Algebra-1

Question Analysis
This question involves identifying the common difference in a given arithmetic sequence.
The main focus is on understanding how to calculate the common difference by finding the difference between consecutive terms.

Key Concept Explanation
The common difference d of an arithmetic sequence is the constant value obtained by subtracting any term from the next term in the sequence, i.e.,  for any positive integer n.

Step-by-Step Solution
1. Identify two consecutive terms in the sequence.
2. For example, take the first term  and the second term .
3. Calculate the difference: 

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