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76%

18 hour(s) left

Solve this equation: (x + 4) (x - 4) = 9

The Fact

Did you know that it only takes 23 people in a room to give you an even chance that two of them will share a birthday? If you take the number of people up to 75 however, then the odds change and the chance of 2 of them sharing a birthday goes up to 99%!

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