If a,b,c,d and p are distinct real numbers such that (a2+b2+c2)p2−2p(ab+bc+cd)+(b2+ c2+d2)≤0, then
Held on 12 May 2012 · Verified 6 Jul 2026.
a,b,c,d are in A.P.
ab=cd
ac=bd
a,b,c,d are in G.P.
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