Thursday

October 23, 2014

October 23, 2014

Posted by **kaela** on Friday, January 4, 2013 at 2:35pm.

- math -
**Steve**, Friday, January 4, 2013 at 3:23pmSn = a(1-r^n)/(1-r), so

(1-r^4)/(1-r^8) = 1/17

r^4 = 1 or 16

1 is no good, so r=2

this will hold, regardless of the first term, T1. Letting T1=1, we have

1,2,4,8,16,32,64,128...

S4 = 15

S8 = 255

S4/S8 = 1/17

**Answer this Question**

**Related Questions**

Math - The first two terms in a geometric series is 12. The sum of the first ...

Math - For the geometric series, S4/S8 = 1/17. Determine the first three terms ...

Geometric Series (Algebra 2) - I need some assistance or a formula when trying ...

math - sorry for before it is my first time using this website and this is the ...

Math. - The first term of a geometric series is 4 and the sum of the first three...

Geometric series - The sum of the first five terms of a geometric series is 186 ...

algebra - Can someone please help me with this problem? Thanks! Evaluate the ...

math studies - An arithmetic series has a first term of -4 and a common ...

math - determine the difference between the sum of the infinite geometric series...

mathematics - the 1st term of arithmetic series is 2 .the 1st ,3rd and 11th ...