AP or not

Exercise and reference answers

Upper category

AP

Lower category

NOT AP

Items

1. Category

   AP

   Item

   2,4,6,8

2. Category

   NOT AP

   Item

   1,2,4,8

3. Category

   AP

   Item

   5,5,5,5

4. Category

   NOT AP

   Item

   1,4,9,16

5. Category

   AP

   Item

   10,7,4,1

6. Category

   NOT AP

   Item

   2,3,5,7

Instructions

Flip the points: does this list add a fixed number each step?

Explanation