If a,b,c are vector of length 4,4,5 resp...

If a,b,c are vector of length 4,4,5 respectively and a,b,c are perpendicular to b+ c , c + a, a+ b respectively, then |a + b + c| =

A

`sqrt57`

B

`sqrt75`

C

`sqrt47`

D

7

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The correct Answer is:

A

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