The first three terms of the sequence are 
, where 
.
Calculate 
to make the sequence geometric and write down the terms.
Calculate to make the sequence arithmetic and write down the terms.
For 
, calculate the sum of the first ten terms of the corresponding geometric sequence.
.The first three terms of the geometric sequence are: 1, 3, 9.
.The first three terms of the arithmetic sequence are: -1, 1, 3.
