K

给出3个参数，N,M,K,怪兽有N滴血，等着英雄来砍自己，英雄每一次打击，都会让怪兽流失[0~M]的血量，到底流失多少？每一次在[0~M]上等概率的获取一个值，求K次打击之后，英雄把怪兽砍死的概率

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