Aₐᵇ = a!/(a-b)!
a! = 1*2*3*....*(a-1)*a
A₆² = 6! / (6-2)! = 6!/4! = 4! * 5*6/4! = 5*6 = 30
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Aₐᵇ = a!/(a-b)!
a! = 1*2*3*....*(a-1)*a
A₆² = 6! / (6-2)! = 6!/4! = 4! * 5*6/4! = 5*6 = 30