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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

11

B

15

C

18

D

36

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HIMALAYA PUBLICATION-VECTORS AND THEIR APPLICATIONS-QUESTION BANK
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