# Arithmetic Progression

## Basic Algebra Review Part 4: Arithmetic Progression (Tagalog)

Formulas:

• The common difference:
$d = a_2 - a_1 = a_3 - a_2 = a_4 - a_3 = ~ ...$
• The nth term:
$a_n = a_m + (n - m)d$
• Sum of the first n terms of AP:
$S_n = \frac{1}{2}n(a_1 + a_n) = \frac{1}{2}n \big[ \, 2a_1 + (n - 1)d \, \big]$

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