1. Probability is not exact it refers to a pattern over a long period of time.

2. e is the possible out comes for a model
So rolling a die e1 = 1, e2 = 2, e3 =3, e4 = 4, e5 = 5, and e6 = 6
Since the die has equal chance of rolling any number the Probable outcome for each element P(e1) or rolling a 1 is 1/6.
The sum of the probabilities of each element must add up to 1.
1/6 + 1/6 + 1/6 + 1/6 + 1/6 + 1/6 = 1

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6. Example: Construct a Probability model for the situation:
Tossing 2 fair coins then a fair die.
TT1 TH1 HT1 HH1
TT2 TH2 HT2 HH2
TT3 TH3 HT3 HH3
TT4 TH4 HT4 HH4
TT5 TH5 HT5 HH5
TT6 TH6 HT6 HH6
Each outcome has a 1/24 chance