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SCIENTISTS have come up with a mathematical formula for songs X Factor finalists should perform.

Singing Norwegian Wood by the Beatles or Baby, Come On Over by Samantha Mumba would almost certainly secure the support of Simon Cowell and the other judges

Using a complex formula based on probability theory, the experts worked out what type of songs are likely to impress Cowell, Cheryl Cole, Louis Walsh and Dannii Minogue.

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