PRC-2 · Chapter 11 · Question 11 of 60
A 4-digit pin code can begin with any number except 0, 1, and 2. If repetition is allowed, what is the probability the pin code begins with a 5 and ends with a 3?
Test yourself: pick an answer
Reveal answer & explanation
Correct answer: B) 1/70
Explanation
The first digit has 7 valid options (3 through 9), so starting with 5 has a 1/7 chance. The last digit has 10 options (0-9), so ending with 3 has a 1/10 chance. 1/7 * 1/10 = 1/70.
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