The nth term of an arithmetic sequence is ,

where = First term of the sequence

d = common difference.

In the sequence with first term .

Find the common difference d by subtracting two consecutive terms.

So, .

To Find out , and apply nth root formula.

The nth term of an arithmetic sequence is .

              (Substitute )

                    (Subtract: )

                          (Multiply: )

                                      (Add: )

The value of .