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Let vecr=veca+lamdavecl and vecr=vecb+mu...

Let `vecr=veca+lamdavecl and vecr=vecb+mu vecm` be two lines in space where `veca= 5hati+hatj+ 2hatk, vecb=-hati+7hatj+8hatk,veci=-4hati +hatj-hatk and vecm = 2hati-5hatj-7hatk` then the `p.v.` of a point which lies on both of these lines, is

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