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C(15,3) = 15!
(15-3)!.3!
C(15,3) = 15.14.13.12!
12! . 3!
C(15,3) = 15.14.13
3.2.1
C(15,3) = 455 Por lo que existen 455 formas de elegir dicha comisión
Espero te sirva salu2!