1.

If a, b, c, d, x are distinct non zero real numbers suchthat (a^(2)+b^(2)+c^(2))x^(2)-2 (ab+bc+cd)x +(b^(2)+c^(2)+d^(2)) le 0, then a, b, c, d are in

Answer»

A.P.
H.P.
G.P.
NONE of these

ANSWER :C


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