ARITHMETIC PROGRESSION (AP SERIES)

It is not a quite technical mathematics .
it is very simple one it actually states that "DIFFERENCE b/w two values or figures remains the same "
FORMULA:
An=a+nD
WHERE:
An=nth term
a=first term
d=difference b/w two consective terms
n= no of terms
EXAMPLE:
2,4,6,8,10,12,..............
Lets suppose we want to measure 55th value in this series how we can calculate it lets watch below
An=?
a=2
d=any two any consective terms (12-10)
n=55
An=2+55(2)
An =112 answer