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A region in the x-y plane is bounded by ...

A region in the `x-y` plane is bounded by the curve `y=sqrt(25-x^2)` and the line `y=0` . If the point `(a ,a+1)` lies in the interior of the region, then (a)`a in (-4,3)` (b) `a in (-oo,-1)` ∪ `(3,oo)` (c)`a in (-1,3)` (d) none of these

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