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2. n2 coins, of which exactly n are silver, are arranged at random in n rows, each containing n coins. What is the chance that at least one row occurs in which there is no silver coin?

3. Given positive real numbers a, b, and c such that a + b + c = 1, show that a^a*b^b*c^c + a^b*b^c*c^a + a^c*b^a*c^b <=1.

please anyone solve these problems or suggest me any books dealing with these problems

Thanks u!!!