Question

Three concentric 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.
• B.
• C.
• D.

Answer 1

The correct option is C

|1-2d|> $\frac{1}{\sqrt{2}}$,d is the common difference