The simplest method for solving A.P. is to examine the difference between the number that came before and the number of each term in the series, which should be constant. Apply the A.P. formula, which satisfies the question's requirement, after that.

1. Common difference of an AP: d = a2 - a1 = a3 - a2 = a4 - a3 = ... = an - an-1 2. nth term of an AP: an = a + (n - 1)d 3. Sum of n terms of an AP: Sn = n/2(2a+(n-1)d) = n/2(a + l), where l is the last term of the arithmetic progression.

The format of an arithmetic progression is a, (a + d), (a + 2d), (a + 3d),..., where a denotes the initial term and d denotes the common difference. Number of Terms: n Tn = a + (n-1)d is the general form. nth term of an arithmetic progression, where Tn