Use the Equation Editor (Insert > Object > Equation Editor). On the
editor's toolbar, the vector and matrix layouts are on the far right.
If you don't see the Equation Editor in the Insert > Object dialog,
you need to rerun the Office installer, tell it you want to customize
the installation, and choose the editor under Office Tools.
--
Regards,
Jay Freedman
Microsoft Word MVP
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Thanks it really helped! Is there any way to centre the top column vector for example when the top one is 'a' and the bottom one is '-b'?