Combinatoricseasy
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A class of 20 students must elect 2 co-presidents (both hold the same title). How many ways can this be done?
A class of 20 students must elect 2 co-presidents (both hold the same title). How many ways can this be done?
A class of 20 students must elect 2 co-presidents (both hold the same title). How many ways can this be done?