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Let B be a subset of a set A and let P (...

Let B be a subset of a set A and let `P (A: B) = [X in P(A) :Xsub B].` (i) Show that: `P (A : phi)=P (A) (ii) If A ={a, b, c, d} and B ={a, b)`. List all the members of the set P (A : B)

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The correct Answer is:
(ii) `P(A:B)={{a,b},{a,b,c},{a,b,d},{a,b,c,d}`
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