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Questions  

If A×B=C, then 

a
A→ . B→ must be zero
b
C→ . A→ may be zero
c
C→ . B→ may be zero
d
C→.A→+B→ must be zero

detailed solution

Correct option is D

Since A→×B→=C→, C→ must be perpendicular to the plane containing A→ and B→. Hence option (4) is correct. Also C→.A→ and C→.B→ must be zero.

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