... Applications 5Secondly, we prove that 2/9Ca, b7/9Ga, b is the best possible lower convexcombination bound of the contraharmonic and geometric means for Seiffert’s mean.If α1> 2/9, then ... ApplicationsSecondly, we prove that 5 /12Ca, b7/12Ha, b is the best possible upper convexcombination bound of the contraharmonic and harmonic means for Seiffert’s mean.If β2< 5/12, then ... X, ∞.Secondly, we present the optimal convex combination bounds of the contraharmonicand harmonic means for Seiffert’s mean as follows.Theorem 2.2. The double inequality α2Ca, b1 − α2Ha,...