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Combinatorics

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Infrequent Math Jokes

COMBIN-E4YLNQ

A math professor tells $4$ different jokes to her combinatorics class each semester.

What is the size of a smallest set of jokes so that she never needs o repeat the same quadruple of jokes over a period of $8$ semesters?

A

$6$

B

$5$

C

$4$

D

$8$

E

$9$

F

$10$