For any three sets A1,A2, A3, let B1=A1,...

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_1uuA_2)`, then which one of the following statement is always true

`A_(1)cup A_(2)cup A_(3)supB_(1)cup B_(2)cup B_(3)`

`A_(1)cup A_(2)cup A_(3)=B_(1)cup B_(2)cup B_(3)`

`A_(1)cup A_(2)cup A_(3)subB_(1)cup B_(2)cup B_(3)`

none of these

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OBJECTIVE RD SHARMA ENGLISH-SETS-Exercise

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