Homework Help: Maths - Geometric Progression

Posted by Anonymous on Tuesday, September 25, 2012 at 10:30am.

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.

Maths - Geometric Progression - Steve, Tuesday, September 25, 2012 at 11:40am
ar = 1/2
a/(1-r) = 4

a = 2-√2
r = 1/4 (2+√2)

or

a = 2+√2
r = 14 (2-√2)

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