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The diagonals of the parallelogram ABCD ...

The diagonals of the parallelogram ABCD intersect at E. If `vec(a), vec(b), vec(c) " and " vec(d)` be the position vectors of its vertices with respect to an arbitary origin O, then show that `vec(a)+vec(b)+vec(c)+vec(d)=4vec(OE)`.

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CHHAYA PUBLICATION-VECTOR-EXERCISE - LONG ANSWER TYPE QUESTIONS
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  12. Defination : Unit vector

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