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     EduGorilla 
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    On the occasion of Diwali festival each student of a class sends greeting cards to the others. 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 20P2
    4. 20!
    5. None of these
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