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Let veca,vecb,vecc be the three vectors ...

Let `veca,vecb,vecc` be the three vectors such that `veca.(vecb+vecc)+vecb.(vecc+veca)+vecc.(veca+vecb)=0 and |veca|=1,|vecb|=4,|vecc|=8,` then `|veca+vecb+vecc|` equals :

A

13

B

81

C

9

D

5

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The correct Answer is:
B
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MODERN PUBLICATION-UNIT TEST PAPER NO. 6 (THREE - DIMENSIONAL GEOMETRY, VECTORS & PROBABILITY)-Select the correct answer
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