Spot the WRONG term in the series

Exercise and reference answers

Questions

1. Items

   1. 5
   2. 35
   3. 10
   4. 20
   5. 80

   Reason

   Pattern doubles: 5,10,20,40,80. 35 should be 40.

   Odd item

   35

2. Items

   1. 1
   2. 4
   3. 17
   4. 9
   5. 25

   Reason

   Series of squares: 1,4,9,16,25. 17 should be 16.

   Odd item

   17

3. Items

   1. 4
   2. 9
   3. 16
   4. 23
   5. 36

   Reason

   Squares: 4,9,16,25,36. 23 should be 25.

   Odd item

   23