document.write( "Question 306621: in how many ways can 2 co-chairs be selected from a club of 20 students? \n" ); document.write( "

Algebra.Com's Answer #219466 by dabanfield(803) $\"\"$ $\"About$

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C(20,2) = 20!/((20-2)!*2!) = 20!/(18!*2!) \n" ); document.write( "

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