Scales can be expressed in different ways, as long as they are an equivalent ratio compared to the original scale. Example: 3 inches to 7 feet

Below write to two more equivalent ways to express this scale

Suppose you are choosing a 6-digit personal access code. this code is made up of 4 digits chosen from 1 to 9, followed by 2 letters chosen from a to z. any of these digits or letters can be repeated. find the total number of personal access codes that can be formed. 492,804 341,172 39,917,124 4,435,236