Dear Aspirant,
By triangle Its will be equilateral as all side are equal so angle between 2 sides will be 60 By sum of vector formula A+B= √[A^2 +B^2 +2AB cosQ] Q=60, A=B=1. So SUM of vector will be √(1+1+2x1/2)=√3 .According to me this should be the answer.
Hope this helps.
Good Luck!
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