Which of the following is not a geometric sequence? 3, 9, 27, 81, ... 2, 4, 8, 16, ... 6, 10, 14, 18, ... 5, 15, 45, 135, ... 3 That's correct! You have selected the sequence that is not geometric. From among a set of options, the student correctly identified which sequence was not geometric. 1 Sorry, that's incorrect. The sequence 3, 9, 27, 81, ... is geometric. Each term is equal to the previous term times three, so this is a geometric sequence with a common ratio of 3. The student was not able to identify a non-geometric sequence from among a set of options. 2 Sorry, that's incorrect. The sequence 2, 4, 8, 16, ... is geometric. Each term is equal to the previous term times two, so this is a geometric sequence with a common ratio of 2. The student was not able to identify a non-geometric sequence from among a set of options. 4 Sorry, that's incorrect. The sequence 5, 15, 45, 135, ... is geometric. Each term is equal to the previous term times three, so this is a geometric sequence with a common ratio of 3. The student was not able to identify a non-geometric sequence from among a set of options. solveGeometricProblems