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")`
`lambdab(lambda ne 0,"a scalar")`
`lambdac(lambda ne 0,"a scalar")`
0

Solution :SINCE, a + 2b = KC
`therefore a+2b+6c=kc+6c`
`=(k+6)c=lambdac""[because lambda=k+rne0]`


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