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Mathematics 17 Online
OpenStudy (anonymous):

The 7 dwarves only have 4 beds, so 3 dwarves sleep on the floor. How many different ways can 4 dwarves be chosen to sleep on the beds A.7 B.42 C.70 D.35

OpenStudy (anonymous):

B.42

OpenStudy (phi):

7 choose 4

OpenStudy (anonymous):

thanks @phi

OpenStudy (anonymous):

wtf? @RedDevil

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