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The Optimal Convex Combination Bounds of Arithmetic and Harmonic Means for the Seiffert's Mean

The Optimal Convex Combination Bounds of Arithmetic and Harmonic Means for the Seiffert's Mean

We find the greatest value and least value such that the double inequality holds for all with . Here , , and denote the arithmetic, harmonic, and Seiffert's means of two positive numbers and , respectively.