Question

What is arthemetic progressions

Answer 1

it is a sequence of numbers such that the differences between the consecutive terms is constant 
for example:- the sequence 5,7,9,11,13,15 .................. is an arthimetic mean with common difference of 2

Answer 2

A progression  is called an airthmetic progression, if the difference of a particular term and its just previous erm is always the same.

example : 1,3,5,7,...........