The sequence is

Find the ratios of consecutive terms.

             ( term)

         ( term)

                 ( term)

The ratios are not constant.

So, the sequence is not geometric.

Find the differences of consecutive terms.

             ( term)

                ( term)

                ( term)

The common differences is not constant.

So, the sequence is not arithmetic.

Thus, the sequence is neither geometric nor arithmetic.

The sequence is neither geometric nor arithmetic.