1.

5 Ifa + b + c = 0. The angle between a and band b and c are 150° and 120°,respectively. Then, the magnitude of vectors a, b and c are in ratio ofa. 1:2:3b. 1:2:13c. 13:2:1d. 2:13:1​

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ANSWER:

I THINK it should be

(C) 13:2:1

Explanation:



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