Arithmetic progression is a sequence of numbers in which the difference between any two consecutive terms is always constant.
For example: 1,3,5,7,9,11.....; 16,13,10,7....
first term = 1
common difference = 3-1 = 2
first term = 16
common difference = 13-16 = -3
you can find the common difference by subtracting any two consecutive number. Given the first term(a) and the common difference(d), you can calculate the nth term of the AP(
) and sum of n terms of the AP(