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Let vector OA and vector OB are two vectors such that |OA + OB| = vector|OA + 2OB|. Then

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Let vector OA and vector OB  are two vectors such that |OA + OB| = vector|OA + 2OB|. Then

(A) ∠BOA = 90°

(B) ∠BOA > 90° 

(C) ∠BOA < 90° 

(D) 60° ≤ ∠BOA ≤ 90° 

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Answer is (B) ∠BOA > 90°

Given 

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