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If A xx B = phi, then is it necessary th...

If `A xx B = phi`, then is it necessary that both A and B are empty?

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Knowledge Check

  • A-B= phi iff

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

  • A cistern can be filled up in 4 h by an inlet A. An outlet B can empty the cistern in 8 h. If both A and B are opened simultaneously, then after how much time will the cistern get filled?

    A
    5h
    B
    7h
    C
    8h
    D
    6h

  • If A and B are two sets such that A xx B = phi , then which of the following must be true ?

    A
    `A = phi` and `B != phi`
    B
    `A = phi` and/or `B = phi`
    C
    `A != phi` and `B = phi`
    D
    `A = phi` and `B = phi`

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