Mathematics Vector Algebra Scalar and Vector Product

What is the value of b such that the scalar product of the vector î + ĵ + k̂ with the unit vector parallel to the sum of the vectors 2î + 4ĵ - 5k̂ and bî + 2ĵ + 3k̂ is unity?

1

-2

2

-1

3

0

4

1

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