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37. If a,b,c are unit vectors satisfying |a-b||a-b| + |b-c||b-c| +|c-a||c-a|| =9, then |2a + 5b + 5c| is |
| Answer» 37. If a,b,c are unit vectors satisfying |a-b||a-b| + |b-c||b-c| +|c-a||c-a|| =9, then |2a + 5b + 5c| is | |