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avatar+1713 

Find the sum of the first 9 terms in the following geometric series.
Do not round your answer.

64+32+16+...

I'm writing this one out but I got confused after:

64+32+16+8+4+2+???????????

 

 

EDIT:

I kind of figured it out....

is it 64+32+16+8+4+2+1+1/2+1/4?

then its:

127.75 right?

 Aug 6, 2019
edited by tommarvoloriddle  Aug 6, 2019
 #1
avatar+6252 
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I guess the series they are after has a=64, r=12648k=0(12)k=641(12)9112=641151212=5114=127.75Well done!

.
 Aug 6, 2019
 #2
avatar+1713 
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Thank you Rom!

tommarvoloriddle  Aug 6, 2019

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