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MathNet 2010 — Part 06 Question 196

Math Olympiad Vault · MathNet 2010 — Part 06

Question 196

The positive integer $i$ is chosen at random such that the probability of a positive integer $k$ being chosen is $\frac{3}{2}$ times the probability of $k+1$ being chosen. What is the probability that the $i^{\text{th}}$ digit after the decimal point of the decimal expansion of $\frac{1}{7}$ is a 2?