1.

vec(a) is perpendicular to both vec(b) and vec(c ). The angle between vec(b) and vec(c ) is (2pi)/(3). If |vec(a)|=2, |vec(b)|=3, |vec(c )|=4 then vec(a ).(vec(b) xx vec(c))=

Answer»

`18 SQRT3`
`12 sqrt3`
`8sqrt3`
`6sqrt3`

ANSWER :B


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