"The scalar product of the vector ` vec a= hat i+ hat j+ hat k` with a unit vector along the sum
Channel: Doubtnut
Date: 27/12/2019

"The scalar product of the vector ` vec a= hat i+ hat j+ hat k`
 with a unit vector along the sum of the vectors ` vec b=2 hat i+4 hat j-5 hat k\\ a n d\\ vec c=lambda hat i+2 hat j+3 hat k`
 is equal to 1. Find the value of `lambda`
 and hence find the unit vector along ` vec b+ vec cdot`"

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