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If vec a = i+j-2k, vec b = -i+2j+k and v...

If `vec a = i+j-2k, vec b = -i+2j+k` and `vec c = i-2j+2k` then a unit vector parallel to `vec a + vec b + vec c` is

A

`1/sqrt6 (2i+j+k)`

B

`1/sqrt3 (i+j+K)`

C

`1/sqrt6(i-2j+k)`

D

`1/sqrt3 (i-j+k)`

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The correct Answer is:
B
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HIMALAYA PUBLICATION-VECTORS AND THEIR APPLICATIONS-QUESTION BANK
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