1.

If a, b, c and d are in H.P. then

A.  \[{{a}^{2}}+{{c}^{2}}>{{b}^{2}}+{{d}^{2}}\]
B.  \[{{a}^{2}}+{{d}^{2}}>{{b}^{2}}+{{c}^{2}}\]
C.  \[ac+bd>{{b}^{2}}+{{c}^{2}}\]
D.  \[ac+bd>{{b}^{2}}+{{d}^{2}}\]
Answer» D.  \[ac+bd>{{b}^{2}}+{{d}^{2}}\]


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