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Question Number 61948 by subhankar10 last updated on 12/Jun/19

$$\mathrm{The}\mathrm{vectors}\mathbf{a},\mathbf{b},\mathbf{c}\mathrm{are}\mathrm{equal}\mathrm{in}\mathrm{length}$$$$\mathrm{and}\mathrm{taken}\mathrm{pairwise},\mathrm{they}\mathrm{make}\mathrm{equal}$$$$\mathrm{angles}.\mathrm{If}\mathbf{a}=\mathbf{i}+\mathbf{j},\mathbf{b}=\mathbf{j}+\mathbf{k}\mathrm{and}\mathbf{c}\mathrm{makes}$$$$\mathrm{an}\mathrm{obtuse}\mathrm{angle}\mathrm{with}X-\mathrm{axis},\mathrm{then}\mathbf{c}=$$

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