4. Determine all values of x where the following series converge. Wherever the series converges, express the series in terms of a function in a non-series form. (2 marks) E OO a ) (2x)n c) (-3)' n=0 2n+1 e) _(27 3 )n n=2 n=2 b) EGG n+1 OO OO d) ( 1 -x) n n=1 f ) n=0 n=2