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A={2,3,5,7,9,10,11,13,15,17,19,20,23,25,29,30}
|A|=16
P(A)=16/30=8/15
|Ω|=30
A={2,3,5,7,9,11,13,17,19,23,29,10,15,20,25,30}
|A|=16
P(A)=16/30=8/15