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Math Help - Two In One

  1. #1
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    Two In One

    Hi guys,

    Here are my questions :-

    1. If C and D are two non null sets, C - D equals ?
    2. 72 matches are played. If each team plays 1 match with another team, total number of teams is ?

    I have no idea about first question...so can u help me out with explanations??

    Thanks in advance !

    Regards,
    deepz007
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  2. #2
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    Crna Gora
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    Re: Two In One

    2.

    \frac{n!}{2!(n-2)!}=72
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  3. #3
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    Re: Two In One

    thanx... wat abt the 1st one
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  4. #4
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    Re: Two In One

    I have no idea...
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  5. #5
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    Re: Two In One

    Quote Originally Posted by deepz007 View Post
    1. If C and D are two non null sets, C - D equals ?
    The usual meaning is C-D=C\cap \overline{D} where \overline{D} is the complement of D.

    Beyond that it is impossible to give any other answer.
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