# Three vectors A,B and C add up to zero. Find which is false. (A×B) × C is not zero unless B,C are parallel

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Three vectors A,B and C add up to zero. Find which is false.

(a) (A×B) × C is not zero unless B,C are parallel

(b) (A×B).C is not zero unless B,C are parallel

(c) If A,B,C define a plane, (A×B) ×C is in that plane

(d) (A×B). C=|A||B||C|  C2=A2+B2

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(c) If A,B,C define a plane, (A×B) ×C is in that plane