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Zarkon
 11 months ago
Best ResponseYou've already chosen the best response.1use the definition of conditional probability and the fact that \[P(A)\le P(A\cup B)\]

adikcomel
 11 months ago
Best ResponseYou've already chosen the best response.2okay i'll try first :)

adikcomel
 11 months ago
Best ResponseYou've already chosen the best response.2P( A intersect B  A) = P( (A intersect B) intersect A)/P(A) = P(A intersect B)/P(A) P( A intersect B  A union B) = P( {A intersect B} intersect {A union B})/P(A union B) ..= P(A intersect B)/P(A union B). As the numerators for the two expressions are equal, while the denominator defining P( A intersect B  A union B) is larger than the denominator defining P( A intersect B  A ), it follows that P( A intersect B  A) >= P( A intersect B  A union B)
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