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Let vec(OA) =veca, vec(OB) = 10veca + 2v...

Let `vec(OA) =veca, vec(OB) = 10veca + 2vecb and vec(OC) =vecb` where , O, A and C are non-collinear points. Let p denote that area of the quadrilateral OABC. And let q denote the area of the parallelogram with OA and OC as adjacent sides. If p=kq, then k= _________

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