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I. (i) If veca=2hati+ 4hatj-4hatk,vecb=-...

I. (i) If `veca=2hati+ 4hatj-4hatk,vecb=-5hati+ 4hatj+ 2hatk and vecc= 3hati-3hatj-2hatk`, then find the magnitude of the vector `veca+ vecb+ 2vecc` and a unit vector in the direction of this vector.

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