The lines (x-1)/(a) = (y-2)/(3) = (z-3)/...

The lines `(x-1)/(a) = (y-2)/(3) = (z-3)/(4) , (x-2)/(3) = (y-3)/(4) = (z-4)/(5)` are coplanar. Then a=

A

1

B

2

C

`-1`

D

`-2`

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The correct Answer is:

A

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