1,2,3,4,5,6..............................(n-1)d
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It is not possible to answer this question without information on whether the terms are of an arithmetic or geometric (or other) progression, and what the starting term is.
That refers to the sum of an arithmetic series.
This question is impossible to answer without knowing the difference between successive terms of the progression.
The sum is the answer to an addition problem. Example: 7 is the sum in the problem 3+4=7
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