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

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

### 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:

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.