Last updated at May 29, 2018 by Teachoo
Transcript
Example 7 Evaluate n!/r!(n r)! when n = 5, r = 2. !/ !( )! Putting n = 5, r = 2 5!/2!(5 2)! = 5!/(2! 3!) = (5 4 3!)/(2! 3!) = (5 4 )/(2 1 ) = 20/2 = 10
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