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If a^{2}+b^{2}+c^{2}=2 then the range ofab + bc + ca is\begin{array}{ll}{\text { 1) }[-1 / 2,1]} & {\text { 2) }[-1 / 2, \infty)} \\ {\text { 3) }[-1,2]} & {\text { 4) }[1, \infty)}\end{array} |
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Answer» thank u very much teacher |
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