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The points (1,0),(0,1),(0,0) and (2k,3k)...

The points `(1,0),(0,1),(0,0)` and `(2k,3k),k!=0` are concyclic if k =

A

' `a` ' can take only rational values

B

' `a` " is irrational

C

no real values of ' `a` ' exists

D

none of these

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A
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