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Medium · Market Microstructure · Quant Trader interview question · probability, approximation, divisibility, mental-math
You are developing a trading strategy that depends on certain probabilistic events. As part of your analysis, you want to determine the probability that the sum of $n$ fair six-sided dice rolls is divisible by 5. What is the approximate probability that the sum of 20 fair six-sided dice rolls is divisible by 5?