olymmath

HMMT 2006 U42

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Suppose hypothetically that a certain, very corrupt political entity in a universe holds an election with two candidates, say AA and BB. A total of 5,825,0435,825,043 votes are cast, but, in a sudden rainstorm, all the ballots get soaked. Undaunted, the election officials decide to guess what the ballots say. Each ballot has a 51%51 \% chance of being deemed a vote for AA, and a 49%49 \% chance of being deemed a vote for BB. The probability that BB will win is 10−X10^{-X}. What is XX rounded to the nearest 10 ?

Dataset text NuminaMath olympiads. Quoted with source.

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510

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