What vector must be added to the two vectors i+ 2j – k and į - j+ 2k so that the resultant may be unit vector along Y-axis?

What vector must be added to the two vectors i+ 2j – k and į - j+ 2

1.	What vector must be added to the two vectors i+ 2j – k and į - j+ 2k so that the resultant may be unit vector along Y-axis?
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What vector must be added to the two vectors i+ 2j – k and į - j+ 2k so that the resultant may be unit vector along Y-axis?​

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What vector must be added to the two vectors i+ 2j – k and į - j+ 2k so that the resultant may be unit vector along Y-axis?