### Deterministic possibilities
All the different possible outcomes.
`Random two bit number has deterministic possibilities 00, 01, 10, 11.`

### Probability distribution
A Probability for each possibility: Pr[x] = p where p $\in$ [0,1]
`For a coinflip this would be Pr[Heads] = 1/2 and Pr[Tails] = 1/2`
Combine all probabilities for all possible outcomes as vector to get probability distribution+
A valid distribution d has $\sum d_i = 1$ and for all i is $d_i \geq 0$