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In the family of concentric circles 2(x^...

In the family of concentric circles `2(x^(2) + y^(2)) = k`, the radius of the circle passing through (1, 1) is a)`sqrt(2)` b)4 c)`2sqrt(2)` d)1

A

`sqrt(2)`

B

4

C

`2sqrt(2)`

D

1

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The correct Answer is:
A
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