Question:A`uuB` = A এবং  `B^c = A` হলে নিচের কোনটি সঠিক? 

A `B = phi` 
B `A = phi` 
C `A sub B` 
D `AnnB = A` 

+ Answer
A 

+ Explanation
`AuuB = A :. BsubA` সুতরাং `B^c = A - B = A

       বা, `B = A - A = phi`

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