Algebra-1

Question Analysis  
This question involves identifying the notation for the first term of an arithmetic sequence.  
The main focus is on recalling the standard notation used in sequences.  

Key Concept Explanation  
In arithmetic sequence notation, represents the -th term, where denotes the first term, the second term, and so on. Thus, the first term is specifically denoted as .  

Step-by-Step Solution  
1. Recall the standard notation for terms in a sequence: (1st term), (2nd term), ...,

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