$\overline{\mathrm{a}}=\overline{\mathrm{i}}-\overline{\mathrm{j}}+3\overline{\mathrm{k}}; \overline{\mathrm{b}}=3\overline{\mathrm{i}}-5\overline{\mathrm{j}}+6\overline{\mathrm{k}}$ . The magnitude of the projection of $2\mathrm{a}-\mathrm{b}$ on $\mathrm{a}+\mathrm{b}$ is

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