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veca, vecb, vecc are the position vector...

`veca, vecb, vecc` are the position vectors of the three points A,B,C respectiveluy. The point P divides the ilne segment AB internally in the ratio 2:1 and the point Q divides the lines segment BC externally in the ratio 3:2 show that `3vec)PQ) = -veca-8vecb+9vecc`.

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