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For which value of n, expression ? (a^n + 1 + b^n + 1)/(a^n + b^n) will be H.M. of two numbers a and b ?

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For which value of n, expression ? (an + 1 + bn + 1)/(an + bn) will be H.M. of two numbers a and b ?

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H.M. of a and b = 2ab/(a + b)

According to equation,

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