The document calculates the probability of randomly selecting a 5-digit number between 65000 and 69999 where the numbers cannot be repeated. It does this in two steps: 1) Calculating the number of possible 5-digit numbers between 65000 and 65999 to be 1344 2) Calculating the number of possible 5-digit numbers between 70000 and 99999 to be 9075 It then adds these numbers and divides by the total number of possible 5-digit numbers, 90000, to get a probability of 11.57%