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Let a,b, c be the three vectors such tha...

Let a,b, c be the three vectors such that `a.(b + c) = b . (c + a) = c . (a + b) =0` and` |a| = 1,|b| = 4,|c|= 8`, then `|a + b + c| =`

A

13

B

81

C

9

D

5

Text Solution

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The correct Answer is:
C
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