Originally Posted by Steve_StudAA
If I'm 20% to hit the lotto today, and 20% to hit the lotto tomorrow, does that make me 40% to hit the lotto. I think not. This math is wrong made right.


Here's how you figure this: your probability of hitting is 0.2 for each day. However, these events aren't mutually exclusive since you might hit on both days.
Pr(both)= 0.2 X 0.2= 0.04
Pr(each day)= 0.2
Pr(hit)= 0.2 + 0.2  0.04= 0.36 or 36%
Event A OR Event B means add probabilities.
Event A AND Event B means multiply probabilities.
If the events aren't mutually exclusive then subtract the probability that both occur from the sum of the individual probabilities.
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