Q .     If the points whose positions vectors are `2hati+hatj+hatk, 6hati-hatj+2hatk,14hati-5hatj+phatk` are collinear,then the value of `p` is

EAMCET 2007
A

`2`

B

`4`

C

`6`

D

`8`

HINT

The determinant of matrix formed by these vectors will be zero, since they are collinear `rArrdet [(2,1,1),(6,-1,2),(14,-5,p)]=0`
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