+0  
 
0
33
1
avatar

The sum of the first n terms of the geometric sequenece 1/4, 1/8, 1/16, ... is 63/128.  Find n.

 Oct 6, 2020
 #1
avatar+27774 
+1

Sum=    a(rn-1) / (r-1)         a = 1/4       r = 1/2     Sum = 63/128      

 

sub in these values and solve for 'n'.....     Let me know if you get stuck

 Oct 6, 2020

24 Online Users