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Three concentrict circles of which the b...

Three concentrict circles of which the biggest is `x^2+y^2=1` , have their radii in A.P. If the line `y=x+1` cuts all the circles in real and distinct points. The interval in which the common difference of the A.P. will lie is :

A

`(0,1/4)`

B

`(0,1/2sqrt2)`

C

`(0,(2-sqrt2)/4)`

D

none of these

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