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A: Find the number of ways of putting 5 letters in the envelope in such a way that no letter is being put in the right envelope. B. In a holiday party, each 6 attendants brings in a gift and exchanges it with someone

else in the party. Find the number of ways of exchanging so that no one gets his/her gift back.

C. If you have 7 pairs of parentheses then how many valid groups of them one can make?

D. The number of ways one can triangulate a regular polygon with 5 sides is…?

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