Now solved: In Exercises 4148, the sample spaces are large and you should use the
Chapter , Problem 8.7.48(choose chapter or problem)
In Exercises 4148, the sample spaces are large and you should use the counting principles discussed in Section 8.6. 48. ATM personal identification number (PIN) codes typically consist of four-digit sequences of numbers. Find the probability that if you forget your PIN, then you can guess the correct sequence (a) at random and (b) when you recall the first two digits.
Unfortunately, we don't have that question answered yet. But you can get it answered in just 5 hours by Logging in or Becoming a subscriber.
Becoming a subscriber
Or look for another answer