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Old 02-23-2011   #5
Lisasmith111
 
Join Date: Nov 2010
Posts: 36
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Quote:
Originally Posted by MAS1 View Post
Can you look at example 3 again? I think there is something wrong with it. It doesn't look like a geometric series.
Hello Mas,

GP from example 3 is derived as follows:-

Common ratio = 7/15 / -7/9 = -3/5

Hence we have the following terms:-

1st term = -7/9

2nd term = -7/9 * -3/5 = 7/15

3rd term = 7/15 * -3/5 = -7/25

4th term = -7/25 * -3/5 = 21/125

5th term = 21/125 * -3/5 = -63/625

6th term = -63/625 * -3/5 = 189/3125

7th term = 189/3125 * -3/5 = -567/15625

Hence -7/9, 7/15, -7/25, 21/125, -63/625, 189/3125, -567/15625...

Hope this helps!
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