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A unit vector parallel to the sum of th...

A unit vector parallel to the sum of the vectors ` 2 i + 3j -k and 4i + 2j + k` is

A

`(6i + 5j)/( sqrt(61))`

B

`(5i+6j)/(sqrt(61))`

C

`k `

D

none of these

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The correct Answer is:
A
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