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Let a G , b G and c G be three non-zero vectors such that b G and c G are non-collinear. If b 5 a G G + is collinear with c G , c 6 b G G + is collinear with a G and 0 c b a G G G G = β + α + , then α + β is equal to-

1. 35
2. –30
3. –25
4. 30

Correct answer: 35

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