PRC-2 · Chapter 11 · Question 2 of 60
A 4-digit pin code can begin with any number except 0 and 1. If repetition of the same digit is allowed, what is the exact probability that a randomly generated pin code begins with a 5 and ends with a 2?
Test yourself: pick an answer
Reveal answer & explanation
Correct answer: C) 1/80
Explanation
The first digit has 8 valid options (2 through 9), so the probability of starting with 5 is 1/8. The final digit has 10 valid options (0-9), so the probability of ending with 2 is 1/10. Combined: 1/8 * 1/10 = 1/80.
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