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If the curves (x^2)/4+y^2=1 and (x^2)/(a...

If the curves `(x^2)/4+y^2=1` and `(x^2)/(a^2)+y^2=1` for a suitable value of `a` cut on four concyclic points, the equation of the circle passing through these four points is

A

`x ^(2) + y ^(2) =2`

B

`x ^(2) +y ^(2) =1`

C

`x ^(2) +y ^(2) =4`

D

none of these

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The correct Answer is:
B
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