- There are 2 possible outcomes
- There are 2 outcomes which have probabilities P and P-1
- P + Q=1 --> there are no other possible outcomes
- probability in any trial is independent of probability in previous trial
- variable (X) is
**random**

1. Always define X

2. X~(n,p)

3. P(X=r) = nCr x Pr x (1- P) n-r

B~(n,p) the expectation for the **number of success'** is **np**

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