Is this an arthimatic sequence ? 10,20,40,80

An arithmetic sequence has a common difference between each term in the series. A geometric sequence has a common ratio between each term in the series.

First, let's determine the rate of change between each term.

10, 20 = multiplied by 2

20, 40 = multiplied by 2

40, 80 = multiplied by 2

The terms appear to have a common ratio of 2, making this a geometric sequence. Therefore, this is NOT an arithmetic sequence.