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MathNet 2006 — Part 05 Question 34

Math Olympiad Vault · MathNet 2006 — Part 05

Question 34

Suppose hypothetically that a certain, very corrupt political entity in a universe holds an election with two candidates, say $A$ and $B$. A total of $5,825,043$ 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 $51\%$ chance of being deemed a vote for $A$, and a $49\%$ chance of being deemed a vote for $B$. The probability that $B$ will win is $10^{-X}$. What is $X$ rounded to the nearest 10 ?