Question

equation to find sum of first n terms​

Answer 1

Answer:

n( n+1 )/2----- It is your answer

Step-by-step explanation:

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Answer 2

Answer:

The sum of the first n terms in an arithmetic sequence is (n/2)⋅(a₁+aₙ). It is called the arithmetic series formula.

Step-by-step explanation:

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