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the seventh term exceeds the fifth term by 1920.find the sum of the first eleven term.r=2?

Posted by Eleven2 on April 20th, 2012

Chosen Answer:

Not enough information to really know what you’re talking about. I’m going to take a shot regardless and see if I can help.

The equation that this probably refers to is y=r^(2n-3).
Thus, the fifth term is 128 and the seventh term is 2048, so y_7-y_5=1920.
The first eleven terms of this series are:
0.5
2
8
32
128
512
2048
8192
32,768
131,072
524,288

So the sum is 699050.5.
by:
on: 7th December 11

Posted in Eleven2 FAQ Tags: chosen, december, eleven, equation, exceeds, fifth, first, going, help, information, probably, really, refers, regardless, series, seventh, shot, talking, term, termr, thus

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One Response to “the seventh term exceeds the fifth term by 1920.find the sum of the first eleven term.r=2?”

1. Austin says:

   December 1, 2011 at 10:09 am

   Not enough information to really know what you’re talking about. I’m going to take a shot regardless and see if I can help.

   The equation that this probably refers to is y=r^(2n-3).
   Thus, the fifth term is 128 and the seventh term is 2048, so y_7-y_5=1920.
   The first eleven terms of this series are:
   0.5
   2
   8
   32
   128
   512
   2048
   8192
   32,768
   131,072
   524,288

   So the sum is 699050.5.

   Reply