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    				| 1. | Let a, b, c be three non-zero vectors such that no two of these are collinear. If the vector a + 2b is collinear with c, then a + 2b + 6 c equals | 
| Answer» `LAMBDAA(lambda ne 0,"a SCALAR")` `therefore a+2b+6c=kc+6c` `=(k+6)c=lambdac""[because lambda=k+rne0]` | |