If the first and \( (2 n-1) \) th term of an AP, GP and \( \mathrm{HP} \) are equal and their \(...

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If the first and \( (2 n-1) \) th term of an AP, GP and \( \mathrm{HP} \) are equal and their \( n \)th terms are \( a, b \) and \( c \) respectively, then
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