Question
Each house number on a street has 2 non-zero digits that are different. What is the probability that the second digit is less than 3, given that the first digit is less than 3?
Answers
oobleck
If the 1st is a 1 or 2, the P(2nd < 3) = 1/8
if not, then P(2nd < 3) = 2/8
so, ...
if not, then P(2nd < 3) = 2/8
so, ...