Maths  Geometric Progression
posted by Anonymous .
The second term of a GP is 1/2 and the sum ti infinity of the series is 4. Find the first term and and the common ratio of the series.

ar = 1/2
a/(1r) = 4
a = 2√2
r = 1/4 (2+√2)
or
a = 2+√2
r = 14 (2√2)