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[" 15.यदि "B sube A" और "P(A:B)={X in P(...

[" 15.यदि "B sube A" और "P(A:B)={X in P(A):X sube" 幕队 "B sube X],[" (i) सिद्ष कीजिए कि "P(A:phi)=P(A)],[" (ii) यदि "A={a,b,c,d}" और "B={a,b}" तो "P(A:B)" ज्ञात कीजिए। "]

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