The range of parameter `' a '`
for which the variable line `y=2x+a`
lies between the circles `x^2+y^2-2x-2y+1=0`
and `x^2+y^2-16 x-2y+61=0`
without intersecting or touching either circle is
`a in (2sqrt(5)-15 ,0)`
`a in (-oo,2sqrt(5)-15 ,)`
`a in (0,-sqrt(5)-10)`
(d) `a in (-sqrt(5)-1,oo)`
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