HOSTING A TOTAL OF 318 FORMULAS WITH CALCULATORS

## sum of first N terms of arithmetic progression

Arithmetic progression (sequence) of terms in which the difference of any term from its preceding term is constant throughout usually written as a,a+d,a+2d,...,a+(n-1)d a being the first term and d the common difference .

## $\frac{n}{2}\left[\mathrm{2a}+d\left(n-1\right)\right]$

where a = first term d = the common difference n = the total number of terms.

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