The outcomes of rolling a six-sided die are: 1, 2, 3, 4, 5, 6. A probability of zero means an outcome is impossible. A probability of 1 means an outcome is certain ...

Probabilities can be written as fractions, decimals or percentages on a scale from 0 to 1. Knowing basic facts about equally likely outcomes can help to solve more complicated problems. Probability is ...

"Yes or no: was there once life on Mars?" I can't say. "What about intelligent life?"' That seems most unlikely, but again, I can't really say. The simple yes-or-no framework has no place for shadings ...