What are some sets that satisfy A∩P(A)ε B?

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The discussion revolves around finding examples of two sets that satisfy the condition A∩P(A)ε B. The user provides an example with A={1,2}, P(A)={∅,{1},{2},{1,2}}, resulting in A∩P(A)=∅. They choose B={∅}, confirming that ∅ is indeed an element of B. The user concludes that their example is correct, as it meets the specified condition.
bonfire09
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Homework Statement


The problem wants me to give an example of two sets that satisfy this condition

A∩P(A)ε B


Homework Equations



None

The Attempt at a Solution


For my example I used this example
A={1,2}
P(A)={∅,{1},{2},{1,2}}
A∩P(A)=∅
B={∅}
∅ε B

Therefore A∩P(A)ε B
is this a correct example?
 
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im allowed to make up a set for set B. But considering that A∩P(A)=∅ then I thought that the empty set has to be an element in set B.
 


It seems to be correct.
 
Question: A clock's minute hand has length 4 and its hour hand has length 3. What is the distance between the tips at the moment when it is increasing most rapidly?(Putnam Exam Question) Answer: Making assumption that both the hands moves at constant angular velocities, the answer is ## \sqrt{7} .## But don't you think this assumption is somewhat doubtful and wrong?

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