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IMO 1981 - Shortlisted problems Question 3

IMO Shortlist · IMO 1981 - Shortlisted problems

Question 3

(CAN) Find the minimum value of
$$\max(a+b+c,b+c+d,c+d+e,d+e+f,e+f+g)$$
subject to the constraints

(i) $a,b,c,d,e,f,g\ge0$,

(ii) $a+b+c+d+e+f+g=1$.