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Let veca,vecb and vecc be non-coplanar v...

Let `veca,vecb` and `vecc` be non-coplanar vectors. Let A,B and C be the points whose position vectors with respect to the origin O are `veca+2vecb+3vecc,-2veca+3vecb+5vecc`and `7veca-vecc` respectively. Then prove that A, B and C are collinear.

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