So, an arithmetic progression is a list of numbers in which each term is obtained by adding a fixed number to the preceding term except the first term.

What does "except the first term" mean here?

Dear Student,
In the definition "An arithmetic progression is a list of numbers in which each term is obtained by adding a fixed number to the preceding term except the first term.", 'except the first term'  means that the given definition will not be followed for the first term because before first term, there is no other term to which a fixed number will be added.
Example:- 1+4+7+10+13+16+....
1+3=4
4+3=7
7+3=10
But, there is no term before 1 to be added to 3.
Regards!
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