On the occasion of Diwali, each student of a class sends greeting cards to every other. If there are….

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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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