A social security number consists of nine digits in a particular order, and repetition of digits is allowed. after seeing the l
ast four digits printed on a receipt, if you randomly select the other digits, what is the probability of getting the correct social security number of the person who was given the receipt?
In this case, the social security number is 9 digit but you already know the first 4 digit. That means the number you need to guess only 5 digits left. The digit is repeatable. Assuming the digits is 0-9 which was 10 digit variation, the calculation would be:
