olymmath

HMMT 2023 C1

  • Combinatorics
  • Answer

There are 800 marbles in a bag. Each marble is colored with one of 100 colors, and there are eight marbles of each color. Anna draws one marble at a time from the bag, without replacement, until she gets eight marbles of the same color, and then she immediately stops. Suppose Anna has not stopped after drawing 699 marbles. Compute the probability that she stops immediately after drawing the 700th marble.

Dataset text NuminaMath olympiads. Quoted with source.

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\frac{99}{101}

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