Question

(5)
The expressions for the sum to n terms of some arithm
are given below. Find the expression for the nth term of each:

i) n2+ 2n ii) 2n2+n iii) n2– 2n
iv) 2n2 - n v) n2 - n

Calculate in head, the sums of the following arithmetic sequen​

Answer 1

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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