The two indices

Exercise and reference answers

Left

Index of a

Items

1. Region

   Index of a

   Item

   Falls each term

2. Region

   Index of a

   Item

   Starts at n

3. Region

   Index of b

   Item

   Rises each term

4. Region

   Index of b

   Item

   Starts at zero

5. Region

   both

   Item

   They sum to n

6. Region

   both

   Item

   Whole numbers

Right

Index of b

Instructions

Drop each property into its index, or into the overlap.

Explanation