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If OACB is a parallelogram with vec OC =...

If OACB is a parallelogram with `vec OC = vec a` and `vec AB = vec b` then `vec OA =`

A

`vec a + vec b`

B

`vec a - vec b`

C

`1/2 (vec b - vec a)`

D

`1/2 (vec a - vec b)`

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The correct Answer is:
D
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