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If for two vectors vecA and vecB,vecA x...

If for two vectors vecA and vecB,vecA xx vecB = 0, which of the following is not correct?

A

(1) They are perpendicular to each other

B

(2) They act at an angle of `60^(@)`

C

(3) They act at an angle of `30°^(@)`

D

(4) They are parallel to each other

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