Question

To establish a formula for the sum of first n terms of an Arithmetic Progression.​

Answer 1

Answer:

n÷2 [2a+(n-1)d]

This is the Formula for sum of first n terms of an arithmetic progressions

Answer 2

Answer:

Step-by-step explanation:

To find the sum of first n terms of an Arithmetic Progression the formula is

S = n/2[2a + (n - 1)d].

In the formula there are four quantities. They are S, a, n and d.

S=Sum of the first n terms of an arithmetic progression

a=first term

n=number of terms

d=common difference

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