In the cube of side â€˜aâ€™ shown in the figure, the vector from the central point of the face ABOD to the central point of the face BEFO will be -

Question

${1 \over 2}a\left( {\widehat k - \widehat i} \right)$

${1 \over 2}a\left( {\widehat j - \widehat i} \right)$

${1 \over 2}a\left( {\widehat j - \widehat k} \right)$

${1 \over 2}a\left( {\widehat i - \widehat k} \right)$

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