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The scalar product of the vector hat i+...

The scalar product of the vector ` hat i+\ hat j+\ hat k\ ` with the unit vector along the sum of vectors `2 hat i+\ 4 hat j-5 hat k` . and `lambda hat i+\ 2 hat j+\ 3 hat k\ ` is equal to one. Find the value of `lambda` .

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The scalar product of the vector hat i+ hat j+ hat k with a unit vector along the sum of vector 2 hat i+4 hat j-5 hat k and lambda hat i+2 hat j+3 hat k is equal to one. Find the value of lambda .

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What is the value of b such that the scalar product of the vector hat(i)+hat(j)+hat(k) with the unit vector parallel to the sum of the vectors 2hat(i)+4hat(j)-5 hat(k) and b hat(i)+2hat(j)+3hat(k) is unity ?

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