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If the point veca is intersection of th...

If the point `veca ` is intersection of the lines `vecr = 7 hati + 10hatj + 13 hatk` and ` + lambda ( 2 hati + 3hatj + 4hatk) vecr = 3hati + 5hatj +7 hatk +mu ( hati +2hatj + 3hatk ) ` then find the value of `veca . (2 hati - hatj + hatk)` .

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