AT least One If probability of event A happening is p and event B happening is q, then the probability that at least one of them happens is (p+q).
* ~+ x- A/ C' Y5 N6 _5 I Example:
5 m$ H8 Z& e7 _4 p There are 20 quarters, 33 nickels, and 47 pennies in a jar. The probability that a randomly selected coin is a quarter= 20/(20+33+47)=20/100=0.2 and the coin is nickel = 33/100 =0.33.The probability it is either a quarter or a nickel = 0.2+0.33=0.53.2 Q$ G% _* @5 a
Remember:8 \* v8 M5 z1 i+ U3 q* N5 U
The events needs to be mutually exclusive, that is if one happens the other cannot happen: a coin is either a quarter or nickel but not both.' c7 @: @' V; b# R3 B4 Q2 [- O
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