SOLUTION: in how many ways can 2 co-chairs be selected from a club of 20 students?

SOLUTION: in how many ways can 2 co-chairs be selected from a club of 20 students?

Algebra.Com

Question 306621: in how many ways can 2 co-chairs be selected from a club of 20 students?
Answer by dabanfield(803) (Show Source): You can put this solution on YOUR website!
C(20,2) = 20!/((20-2)!*2!) = 20!/(18!*2!)
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