### GR9768 Q 51

Posted:

**Tue Apr 06, 2010 1:10 pm**let D be the region in the xy plane in which the series

then the interior of D is

A) an open disk

B) the open region bounded by an ellipse

C) the open region bounded by a quadrilateral

D) the open region bounded by 2 parallel lines

E) an open half plane

**Summation**(x+2y)^k / k converges.then the interior of D is

A) an open disk

B) the open region bounded by an ellipse

C) the open region bounded by a quadrilateral

D) the open region bounded by 2 parallel lines

E) an open half plane