Examples
Examples
Last updated at April 16, 2024 by Teachoo
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