For any three sets A_1, A_2, A_3, let B_1=A_1, B_2=A_2-A_1 and B_3=A_3-(A_1 A_2). Then which one of the following statements is always true?

JEE Main Mathematics question

For any three sets , , , let , and . Then which one of the following statements is always true?

Answer: (B)

Each , so . Conversely, \inA_1\in$

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Question ID VK-003188