With the first term as a and common difference
as d is given by an = a + (n – 1)d
an is also called the general formula of AP. If there
are m terms in the AP,then am represents the last
term which is usually denoted by l
S=n/2[2a+(n-1)d}]
S=n/2[a+l]
It is a list of numbers in which each term is obtained byadding
a fixed number to the preceding term except the first term
The fixed number is called the common difference of the AP
which is represented by variable d
The first term of the AP is denoted by variable a
a,a+d,a+2d,a+3d....
commond difference(d)=a2-a1, a3-a2 or a4-a3
If a,b,c are in AP,then b=a+c/2 and b is called the
arithmetic mean of a and c
Four terms a-3d,a-d,a+d,a+3d are in AP with common
difference 2d