Question: There are 2 1 students. Each day two randomly chosen lucky students get presents: one student gets a book, the other student gets a pencil.

There are 21 students. Each day two randomly chosen lucky students get presents: one student gets a book, the other student gets a pencil. Let x be the total number of the students getting no book and Y be the total number of students getting no pencil after 7 days. Find the correlation coefficient (x,Y).
There are 21 students. Each day two randomly chosen lucky students

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