1.

IF r.a = 0, r. b = 0 and r. c= 0 for some non-zero vector r. Then, the value of [a b c] is

Answer»

0
`(1)/(2)`
1
2

Solution :The given condition MEAN their that R is a PERPENDICULAR to all three vectors a,b and c, This is possible only if they are coplanar.
`[abc]=0`


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