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[" 12."A,B" have position vectors "vec a...

[" 12."A,B" have position vectors "vec a,vec b" relative to the origin "O" and "],[X," Y divide "vec AB" internally and externally respectively in "],[" the ratio "2:1." Then,"vec XY=],[[" (a) "(3)/(2)(vec b-vec a)," (b) "(4)/(3)(vec a-vec b)],[" (c) "(5)/(6)(vec b-vec a)," (d) "(4)/(3)(vec b-vec a)]]

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