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Let a=hati - hatj, b=hati + hatj + hatk ...

Let `a=hati - hatj, b=hati + hatj + hatk` and c be a vector such that `a xx c + b=0` and a.c =4, then `|c|^(2)` is equal to .

A

8

B

`19/2`

C

9

D

`17/2`

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The correct Answer is:
B
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