[" 11.If the G.P's "5,10,20,..." and "10...

[" 11.If the G.P's "5,10,20,..." and "10" thumbers such that: "],[[" (1) "1fa,b,c,d" and "p" are different real numbers such that: "],[(a^(2),b^(2)+c^(2))p^(2)-2(ab+bc+cd)p+(b^(2)+c^(2)+d^(2))<=0," then show that "a,b,c" and "d_(1)],[(2)/(3)(a^(2),b^(2)+c^(2))p^(2)-2(ab+bc+cd)p+(b^(2)+c^(2)+d^(2))," (cand dare in G.P."]]

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