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i. Prove that the points vec a-2vec...

i. Prove that the points `vec a-2vec b+3vec c, 2vec a+3vec b-4vec c and -7vecb+10 vec c` are are collinear, where `vec a, vec b, vec c ` are non-coplanar. ii. Prove that the points `A(1,2,3), B(3,4,7), and C(-3,-2,-5) ` are collinear. find the ratio in which point C divides AB.

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