Arithmetic Progression

If the initial term of an arithmetic progression is {\displaystyle a_{1}}a_{1} and the common difference of successive members is d, then the nth term of the sequence ({\displaystyle a_{n}}a_{n}) is given by:{\displaystyle \ a_{n}=a_{1}+(n-1)d}{\displaystyle \ a_{n}=a_{1}+(n-1)d},