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vecx and vecy are two mutually perpendic...

`vecx` and `vecy` are two mutually perpendicular unit vectors. If the vectors `ahatx + ahaty + c(hatx xx haty), hatx + (hatx xx haty)` and `chatx + chaty +b (hatx xx haty)`, lie in a plane then c is: (A) a,b,c are in AP (B) a,b,c are in GP (C) a,b,c are in HP (D) a,c,b are in GP

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