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OpenStudy (anonymous):
A supervisor who has four identical robot cleaners has to get seven lecture theatres cleaned. In how many ways can the theatres be assigned so that each robot is cleaning at least one? Each theater needs to be assigned exactly one robot
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OpenStudy (anonymous):
Is it S(7,4)?
OpenStudy (anonymous):
or sum for i from 1 to 4 of S(7,i)
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