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Mongolia TST 2011 Test 4 #1

Source: Mongolia TST 2011 Test 4 #1

November 8, 2011
inequalities unsolvedinequalities

Problem Statement

Let t,k,mt,k,m be positive integers and t>kmt>\sqrt{km}. Prove that (2m0)+(2m1)++(2mmt1)<22m2k\dbinom{2m}{0}+\dbinom{2m}{1}+\cdots+\dbinom{2m}{m-t-1}<\dfrac{2^{2m}}{2k}
(proposed by B. Amarsanaa, folklore)