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nCm = m!/n!(m-n)!
7C10 = 10!/7!(10-7)!
7C10 = 10x9x8x7!/7!(3)!
7C10 = 10x9x8/3x2x1
7C10 = 720/6
7C10 = 120 formas de responder el examen
Chau