How many primary digit groupings are used in a terminal digit filing system where primary digits range from 00 to 99?

• A. 100
• B. 10
• C. 50
• D. 9

Answer: (A)

In terminal digit filing, the ending digits of the file number are used to form the primary grouping. If those primary digits span from 00 to 99, there are 100 distinct two-digit values. Each value represents one primary grouping, so the system has 100 primary digit groupings. This comes from counting inclusively from 00 through 99 (99 − 0 + 1 = 100).