The vectors hati+2hatj+3hatk,lamdahati+4...

The vectors `hati+2hatj+3hatk,lamdahati+4hatj+7hatk,-3hati-2hatj-5hatk` are collinear, of `lamda` is equal to

A

3

B

4

C

5

D

6

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The correct Answer is:

A

`|(1,2,3),(lamda,4,7),(-3,-2,-5)|=0`
`implies lamda =3`.

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