Evaluate n! / (n-r)! , when n =6 , r = 2
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n! / (n–r)!
As given that : n = 6 and r = 2
=> 6!/(6–2)!
=> 6!/4!
=> 6.5.4!/4!
=> 6×5 = 30
As given that : n = 6 and r = 2
=> 6!/(6–2)!
=> 6!/4!
=> 6.5.4!/4!
=> 6×5 = 30
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