All of statistics and much of science depends on probability—an astonishing achievement, considering no one’s really sure what it is Skip to main content Scientific American ...

A, for example, may have a probability of 1 out of 3; B, 1 out of 10; C, 1 out of 100. The odds against A, B and C occurring together are the product of their total probabilities (1 out of 3 X 10 ...