RMO Inequalities - 3

Algebra Level 2

Let a,b,c,da,b,c,d be four reals such that a+b+c+d=1a+b+c+d=1. What is the minimum value of (a2+b2+c2+d2)?(a^2+b^2+c^2+d^2) ?

Try part 1 here and part 2 here
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