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     EduGorilla 
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    On the occasion of Diwali, each student of a class sends greeting cards to every other. If there are 20 students in the class, then the total number of greeting cards exchanged by the students is

    Options :-

    1. 20C2
    2. 2 x 20C2
    3. 2 x 20P2 - 1
    4. None of these
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