Match the sequence (term) with the correct type of sequence (definition). match term definition 128, 32, 8, 2, … a) geometric, common ratio is 3 1, 3, 9, 27, … b) arithmetic, common difference is −3 5, 10, 15, 20, … c) arithmetic, common difference is 5 20, 17, 14, 11, … d) geometric, common ratio is 0.25

The sequence is 128, 32, 8, 2, and so on.  note that each new item in this list is obtained by dividing the previous item by 3, or by mult. the previous item by (1/3).  thus, the common ratio is (1/3), and this is a geometric sequence.it's unclear whether you're supposed to do four problems here (a, b, c and d) or just one, or whether "solving" this question means identifying just one sequence that is true.example:     c) arithmetic, common difference is 5 20, 17, 14, 11, …    this does not appear to be a valid arith sequence.  one must add 15 to 5 to get 20, and then subtract 3 from 20 to get 17, 3 from 17 to get 14, and so on.  however, if we changed the problem, we could identify the sequence properly: c) arithmetic, common difference is,    20, 17, 14, 11, …    here the common difference is -3.  how did that "5" end up in this sequence?    

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