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The lines r=a+lambda(bxxc)andr=b+mu(cxxa...

The lines `r=a+lambda(bxxc)andr=b+mu(cxxa)` will intersect if

A

`axxc=bxxc`

B

`a.c=b.c`

C

`bxxa=cxxa`

D

none of these

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The correct Answer is:
B
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