Help please i will mark brainliest

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

How are algebraic expressions evaluated using substitution?

B. two events are dependent if the occurrence of one event changes to occurrence of the second event. true or false