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= 10!/3!.7! . 10!/7!.3!
= 10.9.8.7!/3!.7! . 10.9.8.7!/7!.3!
= 10.9.8/3.2.1 . 10.9.8/3.2.1
= 720/6 . 720/6
= 120 . 120 = 14400 cara