1.

If vec(a),vec(b)andvec(c) are any three vectors, then vec(a)xx(vec(b)xxvec(c))=vec(a)xx(vec(b)xxvec(c)) if and only if

Answer»

`VEC(B),vec(C)` are COLLINEAR
`vec(a)andvec(c)" are collinear "`
`vec(a)andvec(b)" are collinear "`
none

Answer :A::C::D


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