If you can correctly predict the winner of all 63 games of the NCAA men’s basketball tournament in March Warren Buffett will give you $1 billion.

Buffett's Berkshire Hathaway and Quicken Loans announced the "Billion Dollar Bracket Challenge" today. Anyone who enters the free contest online and fills out a perfect bracket will receive the $1 billion in 40 annual installments of $25 million or can opt to receive a lump sum payment of $500 million.

Multiple winners will share the pot. If there are no perfect brackets, the top 20 most accurate brackets among entrants will receive $100,000 each from Quicken Loans to purchase or remodel a home or refinance a mortgage.

The contest begins Monday, March 3, and runs until the start of the 2014 NCAA basketball tournament Wednesday, March 19. This year's championship game will be held April 7 at Cowboys Stadium in Arlington, Texas.

So how likely is it someone will cash in on the $1 billion?

DePaul University math professor Jeff Bergen told Yahoo Sports that the odds of filling out a perfect bracket random are 1 in 9,223,372,036,854,775,808 and the odds of a person with basketball knowledge correctly predicting every game is 1 in 128 billion.

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