Find the sequence that is not arithmetic

Exercise and reference answers

Questions

1. Items

   1. 3, 6, 9, 12
   2. 2, 5, 8, 11
   3. 10, 7, 4, 1
   4. 1, 2, 4, 8

   Odd item

   1, 2, 4, 8

2. Items

   1. 4, 8, 16, 32
   2. 5, 10, 15, 20
   3. 9, 7, 5, 3
   4. 0, 6, 12, 18

   Odd item

   4, 8, 16, 32

3. Items

   1. 6, 11, 16, 21
   2. 1, 3, 9, 27
   3. 20, 15, 10, 5
   4. 2, 12, 22, 32

   Odd item

   1, 3, 9, 27

4. Items

   1. 8, 1, -6, -13
   2. 25, 37, 49, 61
   3. 48, 24, 12, 6
   4. -3, 1, 5, 9

   Odd item

   48, 24, 12, 6

Instructions

Tap the one list whose terms do not share a common difference.

Explanation