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The existence of positive solutions for second order m-point boundary value problem X^''-q(t)f(x,x')x'=0,x(0)=∑↑mi=zbix(ξ),x'(1)=ax'(0)are investigated, where ξi ,bl and a are constants satisfying 0=ξ1<ξ2<…<ξm-1<ξm=1,bi